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2016-07-29 19:57:33

The Comet Swift-Tuttle, which was first spotted in 1862, is thought to be roughly six miles across. Since its first official sighting in the 19th century by Louis Swift and then by Horace Tuttle three days later, this comet hadn't been seen again until 130 years later when its closest pass with Earth occurred in 1992.

Image uploaded by Karen Graham
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