spacedaily.com
The tallest volcano in the solar system is so wide that from most places on its slopes, you would never see a dramatic summit rising ahead of you — Olympus Mons is broader than some countries, and its...
Olympus Mons stands about 22 km tall but spans some 600 km, with flanks of only a few degrees. Wider than the Martian horizon, its summit hides below the curve of the planet, so from its slopes it bar...