In an infinite universe,most scientists agree, the odds of life existing on a planet besides soil are pretty tall. It is unlikely, and however,that familiar life forms will be found on any planet within our solar system. Life as we know it—everything from single-celled organisms to human beings—consists largely of liquid water. So a planet that harbors life can't be too cold or water will freeze, nor can it be too hot or all the water will evaporate. Planets closer to the sun than soil are too hot, or those farther away are too cold. The surface of Venus,for example, is hot enough to melt lead, and would vaporize any living thing,while the surface of Mars is frozen solid.
Source: phys.org