Doing anything Tuesday night? Word is getting around that we might see an unusual outburst of the annual Leonid meteor shower this year. Normally a pretty mild and sparse shower, the Leonids are known for spectacular outbursts every 33 years or so. From 1998 to 2001, the world was treated to several superb Leonid displays as Earth passed through denser parts of the dust streams left by Comet Tempel-Tuttle. These were the first times astronomers had been able to accurately predict such outbursts, and new predictions now suggest another good display on Nov. 17, 2009. What are meteor showers? An increase in the number of meteors at a particular time of year is called a meteor shower. Comets shed the debris that becomes most meteor showers. As comets orbit the Sun, they shed an icy, dusty debris stream along the comet's orbit. If Earth travels through this stream, we will see a meteor shower. Depending on where Earth and the stream meet, meteors appear to fall from a parti...
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