Norris2k on 12 December 2014
Searching life on Mars is like searching human beings in your room... if there is none it doesn't prove you are alone on earth.
The current estimate is that there is 25,000,000,000,000,000,000,000,000 planets in the Universe, 250 trillions in our galaxy... it's absolutely huge, about unbelievable how much planets there are... and so we have only seen 8 of them, for a short time and mostly from far away. It's very hard to imagine not a single planet could be home to a bacteria except for the Earth that is full of life with millions of species. In fact, to prove there is no life outside earth, you would have to visit every single planet. So, there is life unless proven false.
