Two years after President Bush proposed to return astronauts to the moon, NASA announced plans Monday for manned trips there by 2020 and the construction of a permanent base, most likely near the Shackleton crater on the moon's south pole,…

After years of debate over Pluto's planetary status, the International Astronomical Union voted Thursday to classify the celestial object as a "dwarf planet," thereby shrinking the number of major planets in the solar system to eight.

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