This is a list of the tallest mountains in the Solar System. This list includes peaks on all celestial bodies where significant mountains have been detected. For some celestial bodies, different peaks are given across different types of measurement. The solar system's tallest mountain is possibly the central peak of Rheasilvia on the asteroid Vesta, estimated at up to 25 km from peak to base, though its lowest estimate is only 20 km tall. Among the terrestrial planets the tallest mountain is Olympus Mons on Mars, at 21.9 km, which would also make it the tallest overall if Rheasilvia's lowest estimate turns out to be more accurate.
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