Water and volcanoes on Mars. Illustration of Mars in the distant past,showing volcanic activity in the Tharsis Ridge volcanoes (right),as well as a young Olympus Mons (upper centre). At this time,liquid water still existed on the surface of Mars,forming an ocean (upper left) across much of the low-lying northern hemisphere. The atmosphere was thick enough to support clouds and rain. This period in Mars' history ended some 3 billion to 3.5 billion years ago,after which Mars cooled down,lost much of its atmosphere and water,and became largely dead geologically. Today it is a cold,dusty desert planet | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Tucciarone, Joe |
Bildgröße: | 5585 px × 3142 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |