Mars is the only place in the solar system where it's possible for life to become multi-planetarian.

There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.

We're going to understand that there is life on other bodies in the solar system.

The Moon and Mars were the two most likely candidates for life in the solar system; what exists beyond our solar system is mere guesswork.

It's time for the human race to enter the solar system.

I'd love to go into space again if there were a mission to Mars. I'd also love to go to a completely different planetary system, out of our solar system.