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Exoplanet has a 'glowing water vapor' atmosphere

By Ashley Strickland, CNN

Updated 1406 GMT (2206 HKT) August 7, 2017

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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 system
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.
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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 system
This is an illustration of an exomoon losing mass as it's being pulled around the gas giant it orbits.
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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 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.
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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 system
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.
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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 system
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.
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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 system
An artist's impression of a circumplanetary disk around PDS 70 c, a gas giant exoplanet in a star system 370 light-years away.
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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 system
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.
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