The trouble with Pluto

Removing Pluto from the planet list is just the latest in an age-old debate on how many planets make up the solar system

By Jennifer Cutraro, 00:00 AM October 8, 2008

 

 

 

 

 

 

 

 

 

 

 

 

Until recently, the solar system was made up of the sun (far left) and nine planets, including (from left to right) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto -- so small in comparison that it is difficult to make out in this

 

Until recently, the solar system was made up of the sun (far left) and nine planets, including (from left to right) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto -- so small in comparison that it is difficult to make out in this

 

Lunar and Planetary Laboratory

Quick — how many planets are there in the solar system? It's a simple question, but there's no easy answer. You might have learned there are nine: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranu...

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