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There is no generally-accepted evidence that this occurred. The "alien visitors" theories concerning UFOs and alleged abductions are scientifically unsubstantiated. It is possible that non-intelligent lifeforms may have reached Earth in the form of organic material thrown into space by collisions of other planets or stars.
What else can I help you with?
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.
What is the differences between your planets and other planets?
earth is the only planet known to house liquid water and life
Why is it important for humans to explore other planets beside earth?
It is important in case there is life beyond Earth.
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.
Earth is different from the other planets in our solar system because it -?
Because (as far as we currently know) Earth is the only planet in our solar system that supports life.
Is there other life forms on other planets?
Earth's scientist have not found life on other planets to date.
Is there life in any planets?
Yes, only on the Earth. We don't know if the other planets have life
Is there life on other planets is there any similar to earth?
Astronomers have found Earth-sized planets in other solar systems.
Why is there life on earth but not on anty outher planets?
There is life on other planets. Imagine, there are 1000 planets in the Universe for every grain of sand on the earth. That's how many planets there are, so scientifically, the chance that there must be life on other planets as well is much greater than the chance that there is no life.
How is earth different from the outer planets?
Other planets do not have water nor life
What planets are suceptible to life?
Fortunately for the other planets, Earth is the only one.
Why life is possible only in earth not in other planets?
Because Earth is the only place where we can murder the English language and ask questions like, "Why life is possible only in earth not in other planets?"
What planet have aliens?
ALL OF THeM!! But seriously: We know of no planet except Earth with life on it in our solar system, and the conditions on other planets forbid advanced life. There are planets belonging to other suns, but they are very far away, and we have no information about life on them. It is extremely unlikely, but not impossible, that aliens from other solar systems have visited our solar system.
What qualities of earth are different from the other planets?
earth has air , water and life.
Oyxgen on other planets?
No, there is no oxygen on any other planet other than Earth because there is no planet life on the other planets.
Is there any other life on any of the planets that you know of?
We don't know about any other other place, besides Earth, that harbors life. But many scientists think that there is life on other planets.
Are there other living things on the planets?
Other than the Earth, no life has been found on any of the other planets. We are still searching.
