The iridescent cloud reveals new clues about ice formation in the Martian atmosphere (no little green men, sorry).

The Sun sets differently on Mars. Part of that is due to its distance from the star (an average of 142 million miles versus ...

Engineers developed an engine prototype which could reach unprecedented speeds, cutting down interplanetary travel time.

Three small NASA rovers that will explore the lunar surface as a team have been packed up and shipped from the agency's Jet ...