A long-ago inward migration by Jupiter during the formation of our solar system could explain why Mars is small in relation to Earth and Venus, according to a paper published in Nature. Researchers ...

This image shows large sand dunes in the North Polar sand sea on Mars. It is one of a series of repeat images of the same dunes, taken at different times, in order to determine the type and extent of ...

Scientists are calling for the cataloging of human artifacts left on Mars — from spacecraft and landers to rovers, probes, and other debris — to document humanity's earliest steps in interplanetary ...