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Radar clues suggest Venus hides kilometer-scale lava tunnels under its volcanoes

But what would be considered as “ground truth” on a planet where the ground is not visible by the cameras? On Venus, geometry ...
Astronomy

Olympus Mons: Mars’ mega volcano

Olympus Mons, a shield volcano on Mars, is the largest volcano in the solar system, measuring approximately 370 miles in diameter and 26 kilometers in height. The formation of Olympus Mons and three ...