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The Controversies of Exoplanet Research

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Multiple Choice

What is the main controversy surrounding the definition of an exoplanet?

  1. Whether or not a planet should be considered an exoplanet if it is not orbiting a star.
  2. Whether or not a planet should be considered an exoplanet if it is not within the habitable zone of its star.
  3. Whether or not a planet should be considered an exoplanet if it is not massive enough to sustain a rocky surface.
  4. Whether or not a planet should be considered an exoplanet if it is not tidally locked to its star.
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