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Encyclopedia > Mars I

MARS



Credit : P. James/NASA/STSCI
HST image of Mars (February 1995)


Mars periodically returns in the vicinity of the Earth, that made possible to observe the surface. Mars has a tenuous atmosphere. 

As on Earth there are seasons on Mars: polar cap regresses in summer and the ground is covered with frost in winter. These seasonal changes may have suggested the existence of vegetation today denied.