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Space Facts



Last
Solar System
Update:
2010:0206

The Solar System Planets

Our Home Family of Worlds

Our Solar System planets now number (at last official count) only 8. Pluto has been downgraded to "dwarf planet," and relegated as part of the Kuiper Belt. But don't despair. There are a number of dwarf planets newly discovered beyond Pluto. Our former planet is not alone out there.


Size comparison of the inner Solar System planets, the terrestrial planets with the Moon (left to right):
Mercury, Venus, Earth, Luna and Mars.
  The first four planets of the Solar system are called "terrestrials" because of their rough similarity to Earth. The Solar System Facts table gives more comparisons between the planets.
 

Size comparison of the outer Solar System planets, the gas giant planets with Earth (left to right):
Earth, Jupiter, Saturn, Uranus, and Neptune.
  The last four planets of the Solar system are called "gas giants" because the bulk of each such planet is gaseous. The Solar System Facts table gives more comparisons between the planets.
 
 

48-piece Floor Puzzle

Glow-in-the-Dark
Solar System set


Software — Windows Vista / XP,
Nintendo NES, Mac OS X

 
 
 

Software — Windows XP,
Mac OS X


Software — Windows 98 / 2000 /
XP / 95 / Vista


Multimedia Software —
Windows, Mac