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IMSO 2011 Science International – Theory I Question 3

IMSO Science · IMSO 2011 Science International – Theory I

Question 3

In 2006, the International Astronomical Union demoted Pluto from a status of a major planet to a dwarf planet. What is the main reason for this?
  1. Pluto is not spherical in shape.
  2. Pluto does not orbit the Sun like other planets.
  3. It is too far away from the Sun.
  4. It is not the dominant object in its area of the Solar System.