August 22, 2019 | 3:26 PM IST
new exoplanets

NASA’s satellite finds three exoplanets – one of them is a super-Earth

NASA’s Transiting Exoplanet Survey Satellite (TESS) has confirmed discovery of three new exoplanets including a super-Earth – in the habitable region of the star. 
Scientists have characterized the first potentially habitable world - Super-Earth planet- named GJ 357 d - outside the solar system which is about 31 light-years away. The super-Earth was discovered in early 2019 with the help of NASA’s Transiting Exoplanet Survey Satellite (TESS), which was a mission designed to comb the heavens for exoplanets, said a research published in the Astrophysical Journal Letters. 

Experts reveal that the newfound exoplanet is more massive than our own blue planet and said the discovery will provide insight into Earth’s heavyweight planetary cousins. With a thick atmosphere, the planet GJ 357 d could maintain liquid water on its surface like Earth.
Associate professor of astronomy at Cornell University in the US and a member of TESS science team, Lisa Kaltenegger, said, “The planet was GJ 357 d, is also called ‘hot Earth’ and is about 22 percent larger than Earth.”

Exoplanet GJ 357 c is a bit farther out but still too hot for life. It is 3.4 times as massive as Earth and orbits every 9.1 Earth days and has a temperature which is 127 degrees Celsius.
Similarly, GJ 357 b which sits near the outer edge of the system’s habitable zone with a 55.7 day orbit around the star, is 6.1 times more massive than Earth, is probably rocky or gaseous and almost twice as large as Earth and has an equilibrium temperature of -53 degrees Celsius.


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