Earth Quote by David Grinspoon

Now we notice that Mars doesn't have any atmosphere either and won't support life. In spite of the fact that it turns green and…

— L. Ron Hubbard

Mars has a bit of air pressure; maybe we can build up that atmosphere to be a bit more accommodating to humans.

— Buzz Aldrin

Mars is much closer to the characteristics of Earth. It has a fall, winter, summer and spring. North Pole, South Pole, mountains and lots…

— Buzz Aldrin

Human beings are fragile things, and for the period of time it takes to get them to Mars and back, you have dangerous radiation…

— Paul Allen

The Martian atmosphere is very thin. It's like our atmosphere at 100,000 feet.

— John M. Grunsfeld

The surface of Mars is bathed in ultraviolet light, bathed in radiation. Mars's magnetic field is essentially gone, so the surface of Mars is…

— John M. Grunsfeld

Mars does not belong to 'America,' nor to Earth, nor to human beings.

— David Grinspoon

Mars has global warming, but without a greenhouse and without the participation of Martians. These parallel global warmings -- observed simultaneously on Mars and…

— Khabibullo Abdusamatov

When you go to Mars, you need to have made the decision that you're there permanently. The more people we have there, the more…

— Buzz Aldrin

There are a lot of reasons for not doing something. And if humanity had come up with all the reasons for not doing something…

— Buzz Aldrin

Mars once was wet and fertile. It's now bone dry. Something bad happened on Mars. I want to know what happened on Mars so…

— Neil deGrasse Tyson

The single best thing about Mars is the reduced gravity. It's 38 percent of Earth's gravity - about one third. Almost never have you…

— Robert J. Sawyer