Rogue planets with weird atmospheres and no star could host life

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Liquid water and even life can be found on planets with thick atmospheres. Even if the planet is floating on its own through space, it will still be able to hold liquid water for billions of years.

When planets form around a young star, they create a primordial atmosphere of hydrogen and helium. As rocky worlds in our solar system did, many planets lose their atmosphere as they replace it with heavier gases. It is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556

At high enough pressures, hydrogen can act like a greenhouse gas, absorbing heat and trapping it in the atmosphere instead of letting it go to space. The University of Bern used thousands of simulations to figure out how long this effect could keep worlds larger than Earth in the right temperature range.

Depending on the mass of the planet and the distance from its star, this hydrogen greenhouse effect could keep planets warm for up to eight billion years. The thick atmospheres are expected to trap heat from the decay of radioactive elements underground.

There could be life for a long time if the presence of water leads to the emergence of life. We know that there are some organisms on Earth that can survive in a similar environment.

The pressure on the surface of these worlds would be high and there would be few temperature variations. These planets wouldn't have the temperature differences that Earth has. Life would be a little slow and the view would be very foggy.

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Nature Astronomy was published in the journal.