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Up to this point, so far as we know - none. The search for elemental life forms - or even the "ingredients" that might make it possible - on other planets is an area of great interest in astronomy right now. One of the most tantalizing questions is: If there is no life on Mars (and given what we've been able to determine so far, it doesn't appear so) was there ever life on Mars? That may be the #1 question in planetary science they would like to answer at the moment.

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What is the differences between your planets and other planets?

earth is the only planet known to house liquid water and life


Why did God create life on other planets besides earth?

Scientists say that life can be expected to have evolved on other planets, wherever the environment is not so hostile that life can not be supported. They say that in this vast universe there must be many such planets that can support life and that some are likely to support intelligent life forms even more advanced than humans. Whether we believe that our God created the life on other planets is a matter of human faith. No doubt any intelligent life on other planets will never have heard of Earth's gods.


Why is it important for humans to explore other planets beside earth?

It is important in case there is life beyond Earth.


What percent of water is on the earth?

75% Is this a trick question? All water is on the earth. Except some scientists have discovered ice on a few planets, but not in it's liquid state.


How can the Earth support life when other planets cant?

The biggest reason is water. Astronomers think maybe there really may be traces of water or ice on other planets, but Earth has an abundance, perfect for us. Also, many other planet's living conditions are not suitable. Some planets have EXTREMELY hot hot hot or coooollllddd ccccoollllddd weather that we could not live through. There is not fertile soil or animals to eat (we probably wouldn't be eating aliens :P ). And atmospheres aren't as nice, no substantial protection from the sun's rays and gravity not as strong. There are also some more detailed answers but these are mostly the main ideas why the Earth support life when other planets cant.