The Caloris Basin, one of the largest in the Solar System, was discovered in 1974 from images taken by Mariner 10.  It is about 1,550 km (nearly 1,000 miles) across, and circled by mountains some 2 km (1.2 miles) high.
The Caloris Basin, one of the largest in the Solar System, was discovered in 1974 from images taken by Mariner 10. It is about 1,550 km (nearly 1,000 miles) across, and circled by mountains some 2 km (1.2 miles) high.
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Images of the Planet Mercury