The Controversies of Exoplanet Research

Whether or not a planet should be considered an exoplanet if it is not orbiting a star.

Whether or not a planet should be considered an exoplanet if it is not within the habitable zone of its star.

Whether or not a planet should be considered an exoplanet if it is not massive enough to sustain a rocky surface.

Whether or not a planet should be considered an exoplanet if it is not tidally locked to its star.