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Early in the life of the Solar System, things were a lot more violent than they are today. Rocks were flying everywhere, willy-nilly, smacking into the newly formed planets, pocking them with craters and gouging out impact basins.are all heavily scarred. Even Earth – where geological and weathering processes quickly erode most of the evidence – shows signs of giant impacts.Now, that evidence has emerged.
"And perhaps even more important, it shows us that not all impact structures look alike. Impact structures result from a bolide – a body of unspecified composition – that collides with a target planet. The nature of the bolide is important, but so too is the nature of the target." Two impactors, back-to-back, would have punched right through the 10-kilometer-thin crust on the Venusian surface, and splooshed into the molten mantle below. Magma would have bubbled up to the surface, and the surrounding surface crumpled to form the concentric tessera pattern.that it was formed when something large smacked into the icy moon. Frigid water surged from below to fill the hole, and the impact deformed the surrounding crust.
If the lava stays put, it will harden in that raised position. If it drains away, the elevation of the terrain will sink down, as we see with Haastte-Baad.
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