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Why does NASA intentionally crashed Lunar Atmosphere and Dust Environment Explorer (LADEE) on the moon?

The Lunar Atmosphere and Dust Environment Explorer (LADEE) was intentionally crashed into the moon by NASA but why did they crash the craft instead of leaving it in orbit, or was it a part of some ...
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Where is Voyager 1 (or 2) going? In which direction?

Knowing it has exited the solar system, is it traveling in the direction of the center of the galaxy, away from it, orbiting it, or maybe even going perpendicular from the disk-shaped galaxy?