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Stories about: impact

More: << previous 50 Mars' Two Faces, Made by a Huge Impact Scientists have noticed a long time ago that Mars' northern and southern hemispheres are very different. While the northern hemisphere is much flatter, it is also lower than the southern hemisphere, with an elevation difference between the two of about 5 km (3 mi).In the 1980s, researchers supposed that the coll... 16 March 2007 04:22 GMT More: << previous 50