Title: Why do we live on earth? Why can't we live on other planets?? - eNotes.com
Headings: Why do we live on earth?
Why can't we live on other planets??

Astronomy
Why do we live on earth? Why can't we live on other planets??
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Content: Some extreme examples imagine turning Mars or Venus into "second Earths" complete with oceans and atmospheres, but this is a bit of a stretch. Mars lacks important features, such as an active magnetic field, that would be necessary for habitability and cannot be engineered through current human technology. However, terraforming could create localized regions in which human life is, at least, more generously supported than the rest of the planet. For example, living underground on Mars would be a lot easier than living on the surface, or trying to alter the entire planet. Approved by eNotes Editorial Team
enotechris
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For any kind of life to exist as we understand it, certain biochemical functions must be performed. These reactions are contingent on a relatively stable temperature around where water is liquid. Liquid water turns out to be rare in our solar system; the temperature range where water is liquid is only a small fraction of all available temperatures. Only Earth, and maybe one of the moons of Jupiter has water, and therefore life, within this temperature range. Approved by eNotes Editorial Team
writergal06
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We have yet to discover another planet which can support human life.