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MMLU / Why are there no impact craters on the surface of Io?

Problem

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question

Why are there no impact craters on the surface of Io?

choices

  1. Io did have impact craters but they have all been buried in lava flows.
  2. It is too small to have been hit during the Late Heavy Bombardment
  3. Jupiter's strong gravity attracted the planetesimals more strongly than Io and thus none landed on its surface.
  4. Any craters that existed have been eroded through the strong winds on Io's surface.

subject

astronomy

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Source and history

Official source

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