Besides earth, astronomers believe they are most likely to find evidence of life on the planet

Many scientists believe we are not alone in the universe. It's probable, they say, that life could have arisen on at least some of the billions of planets thought to exist in our galaxy alone -- just as it did here on planet Earth. This basic question about our place in the Universe is one that may be answered by scientific investigations. What are the next steps to finding life elsewhere?

I found this answer on nasa.gov I hope this helps.

Astronomers believe life on mars could be the next planet habitable for humans. Any other planet in our solar system cannot support life as it is either too cold or too hot. The planet also needs to have water, a atmosphere, and needs to be able to spin on a axis. Hope this helps!

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary.