Caloris Basin

MERCURY · the impact heard round the planet

SIZE about 1,550 kmANTIPODE the Weird Terrain

One of the largest impact basins in the solar system, so violent that its shockwaves traveled around Mercury and met on the exact opposite side, shattering the ground there into a jumbled region scientists officially call the Weird Terrain. One asteroid, two scars, on opposite faces of a world.

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