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    Question ID:   922         Current Version: 1
Question: What are the eight planets in our solar system?
Category: Science > Astronomy & Space
Keywords: solar system, planet, space, astronomy, sun, moon, earth
Type: what
Rating:(1 ratings)    Views: 613    Discussions: 0   In Watch Lists: 1  

 
    Answer:

Definition of a Planet

  1. must be in orbit around a star while not itself being a star
  2. must be large enough in mass for its self-gravity to overcome rigid body forces so that it assumes a... nearly round shape
  3. has cleared the neighbourhood around its orbit

A planet is a large space object which revolves around a star. It also reflects that star's light. Eight planets have been discovered in our solar system. Mercury, Venus, Earth, and Mars are the planets closest to the Sun. They are called the inner planets. The inner planets are made up mostly of rock. The outer planets are Jupiter, Saturn, Uranus, and Neptune. Jupiter, Saturn, Uranus, and Neptune are large balls of gases with rings around them. All eight planets travel around the Sun in a different orbit.

With this definition, Pluto was automatically disqualified, no longer a planet, because its oblong orbit overlaps with Neptune's.

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[QID:921]    What is the solar system?  
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[QID:4609]    What is the distance between earth and outer space?  
[QID:1191]    What does the Sun burn?  
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