[quote="Simbaholic"]Personally, I think they do.
There are billions of Galaxies out there, and in each those Galaxies are billions of stars/planets. To think that this is the only planet out of all of those billions that has life seems a little silly to me

That's what I think ^^[/quote]
I think also. The Aliens can be like we but and different, adapt at they planet. An example I think can possible exist one aliens species wich breathe Carbon dioxide and drink mineral water extracted underground springs source.
Or maybe can exist a planet with aliens like we, because planet should not have necessarily oceans and sea. It must have underground springs source and in atmosphere 1-2% oxigen. If the planet are big like Jupiter, 1-2% oxigen coresponded the our planet oxigen nivel. And in conclusion it is sufficient.
The Our Planet are are 75% water butt this Watter, 97% are salted, form seasides and Oceans. Just 3% are river and we used for drink.
In conclusion the life can be exist on a planet wich haven't oceans, seasides and over surface water.
In conclusion:
A big planet like Jupiter but solid which are have 1-2% oxigen in atmosphere and have only underground water spring source, can i have life.
But science man search life only if planet are oceans. Do not look where you must.