oh please, your not serious are you? im with lax, there noobs, and know nothing about mars or any other planet, and yes i do, its practically all i do seeing as though i want to be an astronomer... anyway. Mars has a thin atmosphere, recent studies show it has the possibility of being terraformed, it is the next closest habitable planet to earth, the others are gas, or too hot. Mars has water, and carbon dioxide ice at its polar caps, and the two rovers currently studying mars, spirit, and oppurtunity, have found evidence of past water. although no life has been found. you also mentioned europa has a similar ocean to earth, its a hypothesis yes, along with gannymede and callisto, so thats three jovian moons that may harbour sub terranean oceans. and no europa doesnt have oceans on its polar caps, the whole thing is frozen so its one big polar cap, and the reason to believe there is an ocean, a fair few kilometres under the ice is because the friction caused by the friction created by gravity from jupiter and the other gallilean moons. and also you others said that theres trees and plants there, of course we have only been to 8 planets in the entire universe... we havent even seen our whole solar sytem... so far we have discovered about 105 or more planets orbiting other stars... with over 200 billlion stars in our galaxy alone, with each one capable of having planets, and some of the planets are bound to have life, why not intelligent... and also there are an indefinite amount of galaxies, each with billions of stars each with planets, each might be carrying life. i mean seriously...do you think out of the entire vastness of the universe... like over 13 billion light years (a light year is the distance light travels in a year, roughly 9 trillion kilometres) filled with galaxies, you cannot tell me there is no other life.