

The meteors that we see are left over pieces of comet Swift-Tuttle when it last passed through the area of space that the Earth is currently passing through on its orbit around the sun. Most of the meteors are the size of a grain of sand and some are as big as a marble. Almost none of the meteors strike the ground. Instead, the harmlessly burn up in the atmosphere.
Some interesting facts about comet Swift-Tuttle, it's nucleus is nearly 6 miles (10km) in diameter. It makes one complete orbit around the sun every 130 years. It was discovered in 1862 and was last seen in 1992.
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