"Why are O and B stars the brightest in open clusters, and why are red giants the brightest stars in globular clusters?"
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Question
Has earth been hit by any meteors?
The Earth is hit by millions of meteors every day; you can see a few of them as "shooting stars" on any clear night if you look carefully. At least once a week we encounter a meteor big enough to reach the surface, at which point it is called a meteorite. Tons of meteoritic material strike the Earth every year. If you are also interested in collisions with larger comets and asteroids, I recommend the NASA impact hazard website at
May 8, 2003
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