Europe’s Planck spacecraft found evidence that our universe is 13.8 billion years old.
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NASA successfully put two satellites designed to study the Moon's interior structure into the Moon's orbit.
Millions watch NASA spacecraft Ranger 9 crash into the Moon.
The Stardust space probe collected a sample of comet dust.
NASA's Galileo spacecraft made its first flyby of Earth.
A powerful meteor exploded over the Bering Sea.
