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July 2008
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Just as we don't "feel" gravity, we also don't "feel" the earth speeding through space. But we are, and this week, our planet is on a collision course with millions, or as Astronomer Carl Sagan liked to say "billions and billions" of particles left over from the Comet Swift-Tuttle. The result is the famous Perseid meteor shower, which will reach a peak the evenings of August 11th-12th and the 12th-13th... The remains of that comet is spread over millions of miles of space, sometimes called the "river of rubble". They encounter our upper atmosphere at speeds of 37 miles per second... that's per second! The best time to look for these meteors is after midnight, looking toward the northeast-preferably away from city lights. The flashes of meteors show up better in dark sky. A nice lounge chair or hammock makes for comfortable viewing -- as does warm clothing. It gets cool after midnight. Incidentally, the flashes you see are very high in the atmosphere-about 50 to 80 miles above the earth. The actual particles are very small -- usually no bigger than a pea or a single grain of Grape Nuts cereal. That's why very few of them actually make it to earth. |
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