Early life made an inhospitable Earth more habitable, and aliens could be doing the same thing on their worlds, new research proposes.
Once life gains even the tiniest foothold on a planet, it may have the power to transform that world, forcing us to broaden our definition of"habitable," new research suggests.
But the habitable zone is only a rough guide, not a guarantee. Both Mars and Venus sit within the habitable zone of our sun, and those planets are not inhabited. On the other hand, the new research, published to the preprint server arXiv.org, suggests that our current definition of the habitable zone may be too narrow because it doesn't include how life influences a world.
Either way, it would be incredibly difficult for Earth to maintain this much atmospheric oxygen if it weren't for the constant efforts of life. This is certainly true of Earth. The earliest possible signs of life in the fossil record indicate that life may have arisen when our planet was still partially molten. It must have been a highly unfriendly place, but billions of years later, it's pretty great .
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Newfound alien planet has nuclear fusion going in its coreAndrew is a freelance space journalist with a focus on reporting on China's rapidly growing space sector. He began writing for Space.com in 2019 and writes for SpaceNews, IEEE Spectrum, National Geographic, Sky & Telescope, New Scientist and others. Andrew first caught the space bug when, as a youngster, he saw Voyager images of other worlds in our solar system for the first time. Away from space, Andrew enjoys trail running in the forests of Finland. You can follow him on Twitter AJ_FI.
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