Greenhouse Effect Could Extend Habitable Zone in Alien Solar Systems (SPACE.com)

SPACE.com - The distant region beyond Saturn is too cold for liquid water, a necessity for life as we know it. But new research indicates that rocky planets far from their parent star could generate enough heat to keep water flowing - if their atmospheres were made up primarily of hydrogen.

Planets near their suns reap the benefits of light and heat, while those farther away must endure colder temperatures. But the new research indicates that planets with hydrogen-rich atmospheres could contain liquid at their surface even out to fifteen times the distance between the Earth and the Sun. …

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