Mars is about half Earth’s size and roughly a tenth its mass — not really the sort of planet you’d expect to leave ...
TwistedSifter on MSN
Rocks that make up Canada, Greenland, and Hawaii may be what’s left of the original Earth before a Mars-like asteroid hit billions of years ago
The Earth has had an eventful past.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback