Sentences with phrase «thick hydrogen envelopes»
The one GOOD thing about these direct hits would be ELIMINATION of thick Hydrogen envelopes around these types of planets when these envelopes were HEATED by MUCH MORE LUMINOUS HOST STARS to the point where the envelopes FILLED the planets» Hill spheres.
https://www.centauri-dreams.org/ Not exact matches
Kepler - 296f is twice the size of Earth, but scientists do not know whether the planet is a gaseous world, with a thick hydrogen - helium envelope, or it is a water world surrounded by a deep ocean.
But in many instances, the simulations show, even planets starting with rocky cores as little as 1.5 Earth's mass may trap and hold atmospheres containing between 100 and 1000 times the amount of hydrogen found in the water in Earth's oceans — thick, dense envelopes exerting pressures so hellish that life on the planets» surfaces might be almost impossible.
Computer simulations show that planets similar to or larger in mass than the Earth that are born with thick envelopes of hydrogen and helium are likely to retain their stifling atmospheres.