Discussion
Which of the following is NOT included in the planet group?
Answer: C
Pluto is not included in the planet group. In 2006 the International Astronomical Union reclassified Pluto as a dwarf planet because it has not cleared its orbit of other bodies. Mars, Venus and Jupiter are among the eight planets of the solar system: Mars and Venus are terrestrial planets and Jupiter is a gas giant. So Pluto is the one that is not a planet. The IAU decision of 2006 defined a planet as a body that orbits the Sun, is nearly round and has cleared the neighbourhood around its orbit, and Pluto fails the last test, so it is classed as a dwarf planet. Mars, Venus and Jupiter pass all three tests.
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