They don't. No sensible astronomer thinks this is possible.
Astronomers have found evidence that leads them to think that there is a saline ocean under the H2O ice that dominates the surface of Europa. A saline environment would be amenable to life.
They believe there is liquid water underneath its frozen surface. If there is liquid water on Europa, there might also be life.
No, we have never seen any evidence of aliens on Mercury.
No, it doesn't even have a substantial atmosphere.
Astronomers have not yet made any findings regarding the possibility of life on Mars.
Mercury used to be nothing because nobody could really live there or go there because it has no gravity.
no if it could then we well haft to be in 800` suits
no i dont think so because if you live on mercury your going to need oxygen, on mercury, and no it doesn't exist.
According to the university of San Diego life cannot be found in mercury because it contains many deadly gases that not even bacteria could survive in.
Actually, people think from the light reflected of that its blue, though in real life, it is actually orangish in color according to astronomers.
Gliese 581g has been discovered recently and scientists and astronomers think that there could be life on it - as it is in the 'Goldilocks zone' - a zone where there could well be water and land on planets in this area.
Freddie Mercury because he was a musical genious.