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
|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, Uranus, Neptu...
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