(CNN)For the first time, astronomers have peered into the atmosphere of an exoplanet — a planet outside our solar system — and discovered both water vapor and temperatures that could potentially support life, according to a new study.

The exoplanet, known as K2-18b, is eight times the mass of Earth and known as a super-Earth, or exoplanets between the mass of Earth and Neptune. It orbits a red dwarf star 110 light-years away from Earth in the Leo constellation. The planet was first discovered in 2015 by NASA’s Kepler spacecraft.This artist's illustration showcases exoplanet K2-18b orbiting its host star. It's currently the only super-Earth exoplanet that has water vapor in its atmosphere and could be within the right temperature to support life. This artist's illustration showcases exoplanet K2-18b orbiting its host star. It's currently the only super-Earth exoplanet that has water vapor in its atmosphere and could be within the right temperature to support life. Photos: Weird and wonderful planets beyond our solar systemThis artist’s illustration showcases exoplanet K2-18b orbiting its host star. It’s currently the only super-Earth exoplanet that has water vapor in its atmosphere and could be within the right temperature to support life. Hide Caption 1 of 42This is an illustration of an exomoon losing mass as it's being pulled around the gas giant it orbits. This is an illustration of an exomoon losing mass as it's being pulled around the gas giant it orbits. Photos: Weird and wonderful planets beyond our solar systemThis is an illustration of an exomoon losing mass as it’s being pulled around the gas giant it orbits. Hide Caption 2 of 42An illustration shows what the orbit of exoplanet HR 5183 b would look like if it was dropped down in our solar system. It would likely swing from the asteroid belt to out past Neptune, the eighth planet in our solar system.An illustration shows what the orbit of exoplanet HR 5183 b would look like if it was dropped down in our solar system. It would likely swing from the asteroid belt to out past Neptune, the eighth planet in our solar system. Photos: Weird and wonderful planets beyond our solar systemAn illustration shows what the orbit of exoplanet HR 5183 b would look like if it was dropped down in our solar system. It would likely swing from the asteroid belt to out past Neptune, the eighth planet in our solar system.Hide Caption 3 of 42At least two giant planets, aged 20 million years at most, orbit the Beta Pictoris star. A disk of dust and gas surrounding the star can be seen in the background.At least two giant planets, aged 20 million years at most, orbit the Beta Pictoris star. A disk of dust and gas surrounding the star can be seen in the background. Photos: Weird and wonderful planets beyond our solar systemAt least two giant planets, aged 20 million years at most, orbit the Beta Pictoris star. A disk of dust and gas surrounding the star can be seen in the background.Hide Caption 4 of 42This is an artist's interpretation of what super-Earth GJ 357 d might look like. It lies within the habitable zone of its star which is 31 light-years from Earth.This is an artist's interpretation of what super-Earth GJ 357 d might look like. It lies within the habitable zone of its star which is 31 light-years from Earth. Photos: Weird and wonderful planets beyond our solar systemThis is an artist’s interpretation of what super-Earth GJ 357 d might look like. It lies within the habitable zone of its star which is 31 light-years from Earth.Hide Caption 5 of 42An artist's impression of a circumplanetary disk around PDS 70 c, a gas giant exoplanet in a star system 370 light-years away.An artist's impression of a circumplanetary disk around PDS 70 c, a gas giant exoplanet in a star system 370 light-years away. Photos: Weird and wonderful planets beyond our solar systemAn artist’s impression of a circumplanetary disk around PDS 70 c, a gas giant exoplanet in a star system 370 light-years away.Hide Caption 6 of 42This artist's illustration shows two gas giant exoplanets orbiting the young star PDS 70. These planets are still growing by gathering material from a surrounding disk. In the process, they have gravitationally carved out a large gap in the disk.This artist's illustration shows two gas giant exoplanets orbiting the young star PDS 70. These planets are still growing by gathering material from a surrounding disk. In the process, they have gravitationally carved out a large gap in the disk. Photos: Weird and wonderful planets beyond our solar systemThis artist’s illustration shows two gas giant exoplanets orbiting the young star PDS 70. These planets are still growing by gathering material from a surrounding disk. In the process, they have gravitationally carved out a large gap in the disk.Hide Caption 7 of 42This is an artist's illustration of  NGTS-4b, also known to astronomers as "The Forbidden Planet." It whips around its star every 1.3 days and still maintains a gaseous atmosphere in the Neptunian Desert, where no Neptune-sized planets are found.This is an artist's illustration of  NGTS-4b, also known to astronomers as "The Forbidden Planet." It whips around its star every 1.3 days and still maintains a gaseous atmosphere in the Neptunian Desert, where no Neptune-sized planets are found. Photos: Weird and wonderful planets beyond our solar systemThis is an artist’s illustration of NGTS-4b, also known to astronomers as “The Forbidden Planet.” It whips around its star every 1.3 days and still maintains a gaseous atmosphere in the Neptunian Desert, where no Neptune-sized planets are found.Hide Caption 8 of 42An artist's illustration of HD 21749c, the first Earth-size planet found by TESS, as well as its sibling, HD 21749b, a warm mini-Neptune.An artist's illustration of HD 21749c, the first Earth-size planet found by TESS, as well as its sibling, HD 21749b, a warm mini-Neptune. Photos: Weird and wonderful planets beyond our solar systemAn artist’s illustration of HD 21749c, the first Earth-size planet found by TESS, as well as its sibling, HD 21749b, a warm mini-Neptune.Hide Caption 9 of 42A "hot Saturn" passes in front of its host star in this illustration. Astronomers who study stars used "starquakes" to characterize the star, which provided critical information about the planet.A "hot Saturn" passes in front of its host star in this illustration. Astronomers who study stars used "starquakes" to characterize the star, which provided critical information about the planet. Photos: Weird and wonderful planets beyond our solar systemA “hot Saturn” passes in front of its host star in this illustration. Astronomers who study stars used “starquakes” to characterize the star, which provided critical information about the planet.Hide Caption 10 of 42Artist's concept of TESS against background of stars & orbiting planets in the Milky Way. Credit: ESA, M. Kornmesser (ESO), Aaron E. Lepsch (ADNET Systems Inc.), Britt Griswold (Maslow Media Group), NASA's Goddard Space Flight Center & Cornell UniversityArtist's concept of TESS against background of stars & orbiting planets in the Milky Way. Credit: ESA, M. Kornmesser (ESO), Aaron E. Lepsch (ADNET Systems Inc.), Britt Griswold (Maslow Media Group), NASA's Goddard Space Flight Center & Cornell University Photos: Weird and wonderful planets beyond our solar systemArtist’s concept of TESS against background of stars & orbiting planets in the Milky Way. Credit: ESA, M. Kornmesser (ESO), Aaron E. Lepsch (ADNET Systems Inc.), Britt Griswold (Maslow Media Group), NASA’s Goddard Space Flight Center & Cornell UniversityHide Caption 11 of 42A super-telescope made the first direct observation of an exoplanet using optical interferometry. This method revealed a complex exoplanetary atmosphere with clouds of iron and silicates swirling in a planet-wide storm. The technique presents unique possibilities for characterizing many of the exoplanets known today.A super-telescope made the first direct observation of an exoplanet using optical interferometry. This method revealed a complex exoplanetary atmosphere with clouds of iron and silicates swirling in a planet-wide storm. The technique presents unique possibilities for characterizing many of the exoplanets known today. Photos: Weird and wonderful planets beyond our solar systemA super-telescope made the first direct observation of an exoplanet using optical interferometry. This method revealed a complex exoplanetary atmosphere with clouds of iron and silicates swirling in a planet-wide storm. The technique presents unique possibilities for characterizing many of the exoplanets known today.Hide Caption 12 of 42This image shows an artist's impression of the surface of Barnard's star b, a cold Super-Earth discovered orbiting Barnard's star 6 light-years away.This image shows an artist's impression of the surface of Barnard's star b, a cold Super-Earth discovered orbiting Barnard's star 6 light-years away. Photos: Weird and wonderful planets beyond our solar systemThis image shows an artist’s impression of the surface of Barnard’s star b, a cold Super-Earth discovered orbiting Barnard’s star 6 light-years away.Hide Caption 13 of 42This artist's illustration shows newly discovered exoplanet K2-288Bb, 226 light-years away and half the size of Neptune. It orbits the fainter member of a pair of cool M-type stars every 31.3 days. This artist's illustration shows newly discovered exoplanet K2-288Bb, 226 light-years away and half the size of Neptune. It orbits the fainter member of a pair of cool M-type stars every 31.3 days. Photos: Weird and wonderful planets beyond our solar systemThis artist’s illustration shows newly discovered exoplanet K2-288Bb, 226 light-years away and half the size of Neptune. It orbits the fainter member of a pair of cool M-type stars every 31.3 days. Hide Caption 14 of 42This is an artist's impression of the exoplanet HAT-P-11b. The planet has an extended helium atmosphere that's being blown away by the star, an orange dwarf star smaller but more active than our sun.This is an artist's impression of the exoplanet HAT-P-11b. The planet has an extended helium atmosphere that's being blown away by the star, an orange dwarf star smaller but more active than our sun. Photos: Weird and wonderful planets beyond our solar systemThis is an artist’s impression of the exoplanet HAT-P-11b. The planet has an extended helium atmosphere that’s being blown away by the star, an orange dwarf star smaller but more active than our sun.Hide Caption 15 of 42An artist's illustration of what the super-Earth found around the orange-hued star HD 26965 (also known as 40 Eridani A) might look like. The recently discovered exoplanet is being compared to the fictional planet of Vulcan because Star Trek creator Gene Roddenberry said the star was the ideal candidate to host Vulcan, Mr. Spock's home world.An artist's illustration of what the super-Earth found around the orange-hued star HD 26965 (also known as 40 Eridani A) might look like. The recently discovered exoplanet is being compared to the fictional planet of Vulcan because Star Trek creator Gene Roddenberry said the star was the ideal candidate to host Vulcan, Mr. Spock's home world. Photos: Weird and wonderful planets beyond our solar systemAn artist’s illustration of what the super-Earth found around the orange-hued star HD 26965 (also known as 40 Eridani A) might look like. The recently discovered exoplanet is being compared to the fictional planet of Vulcan because Star Trek creator Gene Roddenberry said the star was the ideal candidate to host Vulcan, Mr. Spock’s home world.Hide Caption 16 of 42The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it.The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. Photos: Weird and wonderful planets beyond our solar systemThe TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it.Hide Caption 17 of 42For the first time, eight planets have been found orbiting another star, tying with our solar system for the most known planets around a single star. The Kepler-90 system is in the constellation Draco, more than 2,500 light-years from Earth. For the first time, eight planets have been found orbiting another star, tying with our solar system for the most known planets around a single star. The Kepler-90 system is in the constellation Draco, more than 2,500 light-years from Earth. Photos: Weird and wonderful planets beyond our solar systemFor the first time, eight planets have been found orbiting another star, tying with our solar system for the most known planets around a single star. The Kepler-90 system is in the constellation Draco, more than 2,500 light-years from Earth. Hide Caption 18 of 42This artist's illustration shows exoplanet Ross 128 b, with its red dwarf host star in the background. The planet is only 11 light-years from our solar system. It is now the second-closest temperate planet to be detected, after Proxima b.This artist's illustration shows exoplanet Ross 128 b, with its red dwarf host star in the background. The planet is only 11 light-years from our solar system. It is now the second-closest temperate planet to be detected, after Proxima b. Photos: Weird and wonderful planets beyond our solar systemThis artist’s illustration shows exoplanet Ross 128 b, with its red dwarf host star in the background. The planet is only 11 light-years from our solar system. It is now the second-closest temperate planet to be detected, after Proxima b.Hide Caption 19 of 42WASP-121b, 880 light-years away, is considered a hot Jupiter-like planet. It has a greater mass and radius than Jupiter, making it "puffier." If WASP-121b were any closer to its host star, it would be ripped apart by the star's gravity. WASP-121b, 880 light-years away, is considered a hot Jupiter-like planet. It has a greater mass and radius than Jupiter, making it "puffier." If WASP-121b were any closer to its host star, it would be ripped apart by the star's gravity. Photos: Weird and wonderful planets beyond our solar systemWASP-121b, 880 light-years away, is considered a hot Jupiter-like planet. It has a greater mass and radius than Jupiter, making it “puffier.” If WASP-121b were any closer to its host star, it would be ripped apart by the star’s gravity. Hide Caption 20 of 42NASA's Kepler space telescope team has identified 219 more planet candidates, 10 of which are near-Earth size and in the habitable zone of their stars.NASA's Kepler space telescope team has identified 219 more planet candidates, 10 of which are near-Earth size and in the habitable zone of their stars. Photos: Weird and wonderful planets beyond our solar systemNASA’s Kepler space telescope team has identified 219 more planet candidates, 10 of which are near-Earth size and in the habitable zone of their stars.Hide Caption 21 of 42Welcome to the KELT-9 system. The host star is a hot, rapidly rotating A-type star that is about 2.5 times more massive and almost twice as hot as our sun. The hot star blasts its nearby planet KELT-9b with massive amounts of radiation, leading to a daylight temperature of 7800 degrees Fahrenheit, hotter that most stars and only 2000 degrees cooler than the sun.Welcome to the KELT-9 system. The host star is a hot, rapidly rotating A-type star that is about 2.5 times more massive and almost twice as hot as our sun. The hot star blasts its nearby planet KELT-9b with massive amounts of radiation, leading to a daylight temperature of 7800 degrees Fahrenheit, hotter that most stars and only 2000 degrees cooler than the sun. Photos: Weird and wonderful planets beyond our solar systemWelcome to the KELT-9 system. The host star is a hot, rapidly rotating A-type star that is about 2.5 times more massive and almost twice as hot as our sun. The hot star blasts its nearby planet KELT-9b with massive amounts of radiation, leading to a daylight temperature of 7800 degrees Fahrenheit, hotter that most stars and only 2000 degrees cooler than the sun.Hide Caption 22 of 42This artist's concept shows OGLE-2016-BLG-1195Lb, a planet orbiting an incredibly faint star 13,000 light-years away from us. It is an "iceball" planet with temperatures reaching minus-400 degrees Fahrenheit. This artist's concept shows OGLE-2016-BLG-1195Lb, a planet orbiting an incredibly faint star 13,000 light-years away from us. It is an "iceball" planet with temperatures reaching minus-400 degrees Fahrenheit. Photos: Weird and wonderful planets beyond our solar systemThis artist’s concept shows OGLE-2016-BLG-1195Lb, a planet orbiting an incredibly faint star 13,000 light-years away from us. It is an “iceball” planet with temperatures reaching minus-400 degrees Fahrenheit. Hide Caption 23 of 42LHS 1140b is located in the liquid water habitable zone surrounding its host star, a small, faint red star named LHS 1140. The planet weighs about 6.6 times the mass of Earth and is shown passing in front of LHS 1140. Depicted in blue is the atmosphere the planet may have retained.LHS 1140b is located in the liquid water habitable zone surrounding its host star, a small, faint red star named LHS 1140. The planet weighs about 6.6 times the mass of Earth and is shown passing in front of LHS 1140. Depicted in blue is the atmosphere the planet may have retained. Photos: Weird and wonderful planets beyond our solar systemLHS 1140b is located in the liquid water habitable zone surrounding its host star, a small, faint red star named LHS 1140. The planet weighs about 6.6 times the mass of Earth and is shown passing in front of LHS 1140. Depicted in blue is the atmosphere the planet may have retained.Hide Caption 24 of 42An artist's concept image of the surface of the exoplanet TRAPPIST-1f. Of the seven exoplanets discovered orbiting the ultracool dwarf star TRAPPIST-1, this one may be the most suitable for life. It is similar in size to Earth, is a little cooler than Earth's temperature and is in the habitable zone of the star, meaning liquid water (and even oceans) could be on the surface. The proximity of the star gives the sky a salmon hue, and the other planets are so close that they appear in the sky, much like our own moon.  An artist's concept image of the surface of the exoplanet TRAPPIST-1f. Of the seven exoplanets discovered orbiting the ultracool dwarf star TRAPPIST-1, this one may be the most suitable for life. It is similar in size to Earth, is a little cooler than Earth's temperature and is in the habitable zone of the star, meaning liquid water (and even oceans) could be on the surface. The proximity of the star gives the sky a salmon hue, and the other planets are so close that they appear in the sky, much like our own moon.  Photos: Weird and wonderful planets beyond our solar systemAn artist’s concept image of the surface of the exoplanet TRAPPIST-1f. Of the seven exoplanets discovered orbiting the ultracool dwarf star TRAPPIST-1, this one may be the most suitable for life. It is similar in size to Earth, is a little cooler than Earth’s temperature and is in the habitable zone of the star, meaning liquid water (and even oceans) could be on the surface. The proximity of the star gives the sky a salmon hue, and the other planets are so close that they appear in the sky, much like our own moon. Hide Caption 25 of 42Artist's conception of the binary system with three giant planets discovered, where one star hosts two planets and the other hosts the third. The system represents the smallest-separation binary in which both stars host planets that has ever been observed.Artist's conception of the binary system with three giant planets discovered, where one star hosts two planets and the other hosts the third. The system represents the smallest-separation binary in which both stars host planets that has ever been observed. Photos: Weird and wonderful planets beyond our solar systemArtist’s conception of the binary system with three giant planets discovered, where one star hosts two planets and the other hosts the third. The system represents the smallest-separation binary in which both stars host planets that has ever been observed.Hide Caption 26 of 42This artist's impression shows the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to our solar system. This artist's impression shows the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to our solar system. Photos: Weird and wonderful planets beyond our solar systemThis artist’s impression shows the planet Proxima b orbiting the red dwarf star Proxima Centauri, the closest star to our solar system. Hide Caption 27 of 42This artist's impression shows a view of the surface of the planet Proxima b.This artist's impression shows a view of the surface of the planet Proxima b. Photos: Weird and wonderful planets beyond our solar systemThis artist’s impression shows a view of the surface of the planet Proxima b.Hide Caption 28 of 42An artist's rendering shows Earth-sized exoplanets TRAPPIST-1b and 1c in a rare double transit event as they pass in front of their ultracool red dwarf star, which allowed Hubble to take a peek at at their atmospheres. An artist's rendering shows Earth-sized exoplanets TRAPPIST-1b and 1c in a rare double transit event as they pass in front of their ultracool red dwarf star, which allowed Hubble to take a peek at at their atmospheres. Photos: Weird and wonderful planets beyond our solar systemAn artist’s rendering shows Earth-sized exoplanets TRAPPIST-1b and 1c in a rare double transit event as they pass in front of their ultracool red dwarf star, which allowed Hubble to take a peek at at their atmospheres. Hide Caption 29 of 42Out of a new discovery of 104 exoplanets, astronomers found four similar in size to Earth that are orbiting a dwarf star. Two of them have the potential to support life. The craft depicted in this illustration is the NASA Kepler Space Telescope, which has helped confirm the existence of thousands of exoplanets. Out of a new discovery of 104 exoplanets, astronomers found four similar in size to Earth that are orbiting a dwarf star. Two of them have the potential to support life. The craft depicted in this illustration is the NASA Kepler Space Telescope, which has helped confirm the existence of thousands of exoplanets. Photos: Weird and wonderful planets beyond our solar systemOut of a new discovery of 104 exoplanets, astronomers found four similar in size to Earth that are orbiting a dwarf star. Two of them have the potential to support life. The craft depicted in this illustration is the NASA Kepler Space Telescope, which has helped confirm the existence of thousands of exoplanets. Hide Caption 30 of 42This artist's impression shows a view of the triple-star system HD 131399 from close to the giant planet orbiting in the system. Located about 320 light-years from Earth, the planet is about 16 million years old, making it also one of the youngest exoplanets discovered to date.This artist's impression shows a view of the triple-star system HD 131399 from close to the giant planet orbiting in the system. Located about 320 light-years from Earth, the planet is about 16 million years old, making it also one of the youngest exoplanets discovered to date. Photos: Weird and wonderful planets beyond our solar systemThis artist’s impression shows a view of the triple-star system HD 131399 from close to the giant planet orbiting in the system. Located about 320 light-years from Earth, the planet is about 16 million years old, making it also one of the youngest exoplanets discovered to date.Hide Caption 31 of 42An artistic impression of the planet Kepler-1647b, which is nearly identical to Jupiter in both size and mass. The planet is expected to be roughly similar in appearance. But it is much warmer: Kepler-1647b is in the habitable zone. An artistic impression of the planet Kepler-1647b, which is nearly identical to Jupiter in both size and mass. The planet is expected to be roughly similar in appearance. But it is much warmer: Kepler-1647b is in the habitable zone. Photos: Weird and wonderful planets beyond our solar systemAn artistic impression of the planet Kepler-1647b, which is nearly identical to Jupiter in both size and mass. The planet is expected to be roughly similar in appearance. But it is much warmer: Kepler-1647b is in the habitable zone. Hide Caption 32 of 42HD-106906b is a gaseous planet 11 times more massive than Jupiter. The planet is believed to have formed in the center of its solar system, before being sent flying out to the edges of the region by a violent gravitational event.  HD-106906b is a gaseous planet 11 times more massive than Jupiter. The planet is believed to have formed in the center of its solar system, before being sent flying out to the edges of the region by a violent gravitational event.  Photos: Weird and wonderful planets beyond our solar systemHD-106906b is a gaseous planet 11 times more massive than Jupiter. The planet is believed to have formed in the center of its solar system, before being sent flying out to the edges of the region by a violent gravitational event. Hide Caption 33 of 42Kepler-10b orbits at a distance more than 20 times closer to its star than Mercury is to our own sun. Daytime temperatures exceed 1,300 degrees Celsius (2,500 degrees Fahrenheit), which is hotter than lava flows on Earth. Kepler-10b orbits at a distance more than 20 times closer to its star than Mercury is to our own sun. Daytime temperatures exceed 1,300 degrees Celsius (2,500 degrees Fahrenheit), which is hotter than lava flows on Earth. Photos: Weird and wonderful planets beyond our solar systemKepler-10b orbits at a distance more than 20 times closer to its star than Mercury is to our own sun. Daytime temperatures exceed 1,300 degrees Celsius (2,500 degrees Fahrenheit), which is hotter than lava flows on Earth. Hide Caption 34 of 42This Jupiter-like planet in the HD-188753 system, 149 light-years from Earth, has three suns. The main star is similar in mass to our own Sun. The system has been compared to Luke Skywalker's home planet Tatooine in "Star Wars." This Jupiter-like planet in the HD-188753 system, 149 light-years from Earth, has three suns. The main star is similar in mass to our own Sun. The system has been compared to Luke Skywalker's home planet Tatooine in "Star Wars." Photos: Weird and wonderful planets beyond our solar systemThis Jupiter-like planet in the HD-188753 system, 149 light-years from Earth, has three suns. The main star is similar in mass to our own Sun. The system has been compared to Luke Skywalker’s home planet Tatooine in “Star Wars.” Hide Caption 35 of 42Kepler-421b is a Uranus-sized transiting exoplanet with the longest known year, as it circles its star once every 704 days. The planet orbits an orange, K-type star that is cooler and dimmer than our Sun and is located about 1,000 light-years from Earth in the constellation Lyra. Kepler-421b is a Uranus-sized transiting exoplanet with the longest known year, as it circles its star once every 704 days. The planet orbits an orange, K-type star that is cooler and dimmer than our Sun and is located about 1,000 light-years from Earth in the constellation Lyra. Photos: Weird and wonderful planets beyond our solar systemKepler-421b is a Uranus-sized transiting exoplanet with the longest known year, as it circles its star once every 704 days. The planet orbits an orange, K-type star that is cooler and dimmer than our Sun and is located about 1,000 light-years from Earth in the constellation Lyra. Hide Caption 36 of 42Astronomers discovered two planets less than three times the size of Earth orbiting sun-like stars in a crowded stellar cluster approximately 3,000 light-years from Earth in the constellation Cygnus.Astronomers discovered two planets less than three times the size of Earth orbiting sun-like stars in a crowded stellar cluster approximately 3,000 light-years from Earth in the constellation Cygnus. Photos: Weird and wonderful planets beyond our solar systemAstronomers discovered two planets less than three times the size of Earth orbiting sun-like stars in a crowded stellar cluster approximately 3,000 light-years from Earth in the constellation Cygnus.Hide Caption 37 of 42This artist's conception shows a hypothetical planet with two moons orbiting in the habitable zone of a red dwarf star. The majority of the sun's closest stellar neighbors are red dwarfs.This artist's conception shows a hypothetical planet with two moons orbiting in the habitable zone of a red dwarf star. The majority of the sun's closest stellar neighbors are red dwarfs. Photos: Weird and wonderful planets beyond our solar systemThis artist’s conception shows a hypothetical planet with two moons orbiting in the habitable zone of a red dwarf star. The majority of the sun’s closest stellar neighbors are red dwarfs.Hide Caption 38 of 42Kepler-186f was the first validated Earth-sized planet to be found orbiting a distant star in the habitable zone. This zone a range of distance from a star where liquid water might pool on the planet's surface.Kepler-186f was the first validated Earth-sized planet to be found orbiting a distant star in the habitable zone. This zone a range of distance from a star where liquid water might pool on the planet's surface. Photos: Weird and wonderful planets beyond our solar systemKepler-186f was the first validated Earth-sized planet to be found orbiting a distant star in the habitable zone. This zone a range of distance from a star where liquid water might pool on the planet’s surface.Hide Caption 39 of 42Kepler-69c is a super-Earth-size planet similar to Venus. The planet is found in the habitable zone of a star like our sun, approximately 2,700 light years from Earth in the constellation Cygnus.Kepler-69c is a super-Earth-size planet similar to Venus. The planet is found in the habitable zone of a star like our sun, approximately 2,700 light years from Earth in the constellation Cygnus. Photos: Weird and wonderful planets beyond our solar systemKepler-69c is a super-Earth-size planet similar to Venus. The planet is found in the habitable zone of a star like our sun, approximately 2,700 light years from Earth in the constellation Cygnus.Hide Caption 40 of 42The Kepler-444 system formed when the Milky Way was just 2 billion years old. The tightly packed system is home to five planets that range in size, the smallest is comparable to the size of Mercury and the largest to Venus, orbiting their sun in less than 10 days. The Kepler-444 system formed when the Milky Way was just 2 billion years old. The tightly packed system is home to five planets that range in size, the smallest is comparable to the size of Mercury and the largest to Venus, orbiting their sun in less than 10 days. Photos: Weird and wonderful planets beyond our solar systemThe Kepler-444 system formed when the Milky Way was just 2 billion years old. The tightly packed system is home to five planets that range in size, the smallest is comparable to the size of Mercury and the largest to Venus, orbiting their sun in less than 10 days. Hide Caption 41 of 42This artistic concept image compares Earth, left, with Kepler-452b, which is about 60% larger. Both planets orbit a G2-type star of about the same temperature; however, the star hosting Kepler-452b is 6 billion years old -- 1.5 billion years older than our sun.This artistic concept image compares Earth, left, with Kepler-452b, which is about 60% larger. Both planets orbit a G2-type star of about the same temperature; however, the star hosting Kepler-452b is 6 billion years old -- 1.5 billion years older than our sun. Photos: Weird and wonderful planets beyond our solar systemThis artistic concept image compares Earth, left, with Kepler-452b, which is about 60% larger. Both planets orbit a G2-type star of about the same temperature; however, the star hosting Kepler-452b is 6 billion years old — 1.5 billion years older than our sun.Hide Caption 42 of 42planet K2-18bexoplanets exo-IoAndrew Howard exoplanets02 exoplanets gallery 081902 TESS exoplanets01 exoplanets gallery 071201 exoplanetsExoplanet NGTS-4b Forbidden Planetexoplanets 0415exoplanets gallery 032802 exoplanets gallery 0328exoplanets gallery 032702 barnard's starexoplanets gallery_K2-288Bbexoplanets galleryVulcan planetTRAPPIST-1 planetary system01 nasa kepler90dwarf planet ross PHOTO ILLUSTRATION RESTRICTED exoplanet WASP-121bKepler new planet candidatesexoplanets gallery KELT-9 systemexoplanets gallery OGLE01 exoplanets galleryexoplanet TRAPPIST-1fbinary system three giant planets04 new exoplanet 082401 new exoplanet 0824exoplanets gallery 0725Kepler K2 mission 100 new planetsthree planet star system 01 Kepler-1647bexpoplanets 1 hd106906bexoplanets 10 kepler 10bexoplanets 9 tatooineexoplanets 8 kepler 421 bexoplanets 7 cluster planetsexoplanets 6 red dwarf planetsexoplanets 3 kepler 186fexoplanets 5 kepler 69cexoplanets 3 kepler 444 systemexoplanets 2 kepler 452 bA research team used archival data collected by the Hubble Space Telescope between 2016 and 2017 that captured starlight as it passed through the atmosphere of the exoplanet. The researchers said they clearly saw the signature for water vapor in the atmosphere when they put the data through algorithms. They also observed the signatures of hydrogen and helium in the atmosphere, two of the most abundant elements in the universe.The detection of water vapor in the atmosphere of this exoplanet is particularly exciting to the researchers because the exoplanet also lies within the habitable zone of its star, which includes the right temperatures for liquid water to exist on the surface of the planet and potentially support life as we understand it.Scientists may have found a fiery exomoon that's like a volcanic planet from 'Star Wars' Scientists may have found a fiery exomoon that's like a volcanic planet from 'Star Wars' Scientists may have found a fiery exomoon that's like a volcanic planet from 'Star Wars' The researchers published their findings in the journal Nature Astronomy on Wednesday. Read More”Finding water in a potentially habitable world other than Earth is incredibly exciting,” said Angelos Tsiaras, study author and research associate at the University College London’s Centre for Space Exochemistry Data. “K2-18b is not ‘Earth 2.0’ as it is significantly heavier and has a different atmospheric composition. However, it brings us closer to answering the fundamental question: Is the Earth unique?”Giant exoplanet is 'like a wrecking ball,' astronomers sayGiant exoplanet is 'like a wrecking ball,' astronomers sayGiant exoplanet is 'like a wrecking ball,' astronomers sayThe exoplanet completes one orbit around its star every 33 days and it’s much closer to its star than Earth is to the sun. But the red dwarf star is also much cooler than our sun. Based on the researchers’ calculations, they believe the planet could even be at a similar temperature to that of Earth. But the range extends to include temperatures much colder or warmer than Earth because of the constraints of their data.The red dwarf star is an active one, however, which is likely exposing the exoplanet to more radiation than Earth receives.”With so many new super-Earths expected to be found over the next couple of decades, it is likely that this is the first discovery of many potentially habitable planets,” said Ingo Waldmann, study co-author and lecturer in extrasolar planets at the University College London’s Centre for Space Exochemistry Data. “This is not only because super-Earths like K2-18b are the most common planets in our Galaxy, but also because red dwarfs – stars smaller than our Sun – are the most common stars.”Exoplanets could have better conditions for life than Earth, study saysExoplanets could have better conditions for life than Earth, study saysExoplanets could have better conditions for life than Earth, study saysThe Hubble Space Telescope is only sensitive to the signature of water, but future telescopes like the James Webb Space Telescope and the European Space Agency’s ARIEL mission will be able to study exoplanet atmospheres in greater detail with more advanced instruments. The researchers believe that other elements like nitrogen and methane could also be present in the atmosphere, but only future observations by more advanced telescopes will reveal them. “Our discovery makes K2-18 b one of the most interesting targets for future study,” said Giovanna Tinetti, study co-author and principal investigator for ARIEL. “Over 4,000 exoplanets have been detected but we don’t know much about their composition and nature. By observing a large sample of planets, we hope to reveal secrets about their chemistry, formation and evolution.”

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https://www.cnn.com/2019/09/11/world/water-atmosphere-exoplanet-scn/index.html

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