Yes, Earth
So far, earth is the only planet known to support life, but many scientists thing that life probably exists on other planets.
There are no planets but the planet Jupiter has a moon called Europa that is covered in ice and might have a ocean full of life.
None that are known. Earth is the only place in the universe known to have life and it is highly unlikely that any of the dwarf planets in our solar system have any life.
I believe they discovered a planet a couple of years ago, that they named Krypton, but i believe it has been downgraded since then to a dwarf planet or an asteriod. And I don't think it could sustain life. So no superman coming from that planet!
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.
Well, certainly no intelligent life, anyway. (The only known life at this time is on Earth, which is one of the planets.)
Yes, only on the Earth. We don't know if the other planets have life
No one actually found any human life on any other planets yet, but there is known to be some plant life out on mars.
There is currently no evidence to suggest that any form of life exists on Mars. However, scientists believe that Mars may have had conditions suitable for life in the past, and they continue to search for signs of microbial life on the planet.
No. Also, if there is any life on any of the planets, it would not be alien; it would be native.
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.
No