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This is because it is highly unlikely that the exact circumstances needed to form life will occur. It happened to occur on earth, and that is why it has life. It is theoretically possible for more planets to have life on them.
Adding to your answer. Earth is very lucky because it in the habitable zone which means it not too close to the sun and its not too far away. A planet has to be in the habitable to sustain liquid on its surface. They suspect there might be life(single celled) on mars because it is close to the habitable zone. Astronomers have discovered other planets that are in the habitable zone but haven't yet found other life forms.
What else can I help you with?
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.
Was there ever life on any other planets?
No one actually found any human life on any other planets yet, but there is known to be some plant life out on mars.
Is there life in any planets?
Yes, only on the Earth. We don't know if the other planets have life
What does life on any other planets like?
No
Is there life is exist on any other planets?
At this time we have no evidence of any extraterrestrial 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.
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.
Is there life on other planets is there any similar to earth?
Astronomers have found Earth-sized planets in other solar systems.
Are there any other planets that sustain life?
So far, earth is the only planet known to support life, but many scientists thing that life probably exists on other planets.
Are there any possiblities of life on other planets?
Yes, but not on any of the ones in our solar system.
Is their other planets that have life on them?
NO- People have found water on other planets but there is no life there.
Is there life like aliens on other planets?
We don't know if there is life on other planets or not. Most scientists suspect that there probably is life somewhere in the Universe other than Earth, but we've never found any yet.
