I'd guess they found evidence of water.
Mars discovery 'one for history books'
Very exciting...what could it possibly be? I'm all for speculation at this point ^_^
Hopefully not some sort of crazy alien race living under the surface...
It must be pretty big, right?
Probably true.
Also, there's no way anything from earth is on mars other than a rover. It's too far away and the rover is covering far too little ground.
this is all garbage to make people think they arent wasting money. theres is only one definitive proof that life exists other places than earth--a freaken alien in a jar. realistically there probably is life in other parts of the universe, but it isnt nearly so common that you have a chance of finding it on every eighth planet