Mars reveals little by way of surface markings in binoculars. A modest sized amateur telescope is really required to see any detail. The Moon, however, is always a fascinating target for binoculars. It is particularly rewarding to scan the boundary region between the dark and light parts - what astronomers call "the terminator" - where long shadows emphasize peaks and valleys. Try looking on successive nights and observe the change in appearance as the boundary between lunar day and night creeps acros different surface features.
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