How do similar landforms appear in close-up views of
Earth and Mars? The panoramas below show the landscapes
near impact craters on the two planets.
A few scientists have speculated that the earliest
microscopic life forms may have come to Earth from somewhere
else in space, by "hitchhiking" on a comet
or asteroid. If this were true, life forms could reach
Mars in the same way. We could pose a theoretical question:
Would life forms landing on an early Earth or Mars find
themselves in an environment that would support life?
! Use the arrow buttons to explore each panoramic image.