Halley’s comet is one of the Earth’s most well known periodic comets, appearing every 75 years or so (last time in 1986). The comet has a coma or atmosphere that surrounds it that reaches up to 100,000 km across and a tail that reaches back 100 million km. Although its coma is huge, the comet’s nucleus is rather small: it measures in around 15 km long, 8 km wide and 8 km thick.
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