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MMLU / Why does the plasma (ion) tail of a comet always point away from the Sun?

Problem

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question

Why does the plasma (ion) tail of a comet always point away from the Sun?

choices

  1. Radiation pressure from the Sun's light pushes the ions away.
  2. The conservation of the angular momentum in the tail keeps it always pointing away from the Sun.
  3. The ions are following Keplerian orbits that lead away from the Sun.
  4. The solar wind electromagnetically "blows" the ions directly away from the Sun.

subject

astronomy

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Official source

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