Did Powerful Asteroid Impacts Make Venus So Different From Earth? universetoday storybywill
Thanks to missions like the Magellan probe and the extensive radar mapping it conducted in the 1990s, scientists began mapping the surface of Venus in detail. To their surprise, the surface appeared far smoother than expected, which suggested that a certain mechanism was responsible for “recycling” the surface. On Earth, impact craters are largely removed by resurfacing events caused by tectonic activity, but Venus has no such activity to explain its smooth features.
Over time, the intensity of the bombardment declined as the planets achieved more stable orbits. While Earth and Venus formed in the same general area of the inner Solar System, the differences in their distances from the Sun mean that they have different impact histories – i.e., the number of impacts and their outcomes were slightly different.
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