I just read yesterday in Popular Science magazine that in the year 1989, a mile-wide asteroid (or was that more than 1 mile wide? :D) swept across the Earth's orbit 6 hours after the Earth had passed. That's more frightening than you think.
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On November 9, 2011 (Wednesday), an asteroid (2005 YU55) passed by Earth within the moon's orbit. Here are some of the links that I found about this topic:
1) National Aeronautics and Space Administration (NASA)
2) CBC News (Canada)
visit NASA's website: www.nasa.gov
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