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  •  The Categories
->   inner planets  Mercury, Venus, Earth (and moon), and Mars. The inner planets, the closest to the Sun, are solid spheres of rock. Did you know that the inner planets were constantly bombarded by asteroids and meteorites during their first 600 million years in existence? That's why there are craters of varying sizes on the inner planets and their satellites.
->   outer planets  Jupiter (and moons), Saturn, Uranus, Neptune, and Pluto. The outer planets, with the exception of Pluto, are large gaseous spheres with rings.
->   nebulae  Nebulae are clouds of interstellar gas and dust. A nebula can be the remnant of a supernova, or the birthplace of new stars.
->   miscellaneous  Asteroids, spacecraft, comets, and galaxies. Did you know that between the inner and outer planets is an asteroid belt?
Space Postcards
  •   Incredible pictures and interesting facts make these space postcards the perfect greetings for anyone interested in astronomy. Take a tour through the solar system in the planet sections. Visit magnificent coulds of interstellar gas and dust in the nebulae section. You'll find asteriods, comets, and more in the miscellaneous section :)  
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   To send a space postcard greeting, first select a category from the list above. You may also click one of the tabs in the page header. To learn more about astronomy, visit NASA.

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Space Postcards