Planets in our Solar system

 

Planets in our Solar system size comparison. Largest to smallest are pictured left to right, top to bottom: Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury.   

1. Ever since the discovery of Pluto in 1930, kids grew up learning about the nine planets of our solar system. 
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4. That all changed starting in the late 1990s, when astronomers began to argue about whether Pluto was a planet. 
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7. The International Astronomical Union here decided in 2006 to call Pluto a "dwarf planet," reducing the list of "real planets" in our solar system to eight. 

 

Solar moons