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How big is Halley's Comet?

Topics: ScienceAstronomyHalley's Comet, Comets

Answer

Like all comets, as Halley nears the Sun, its volatile compounds begin to sublime from the surface of its nucleus. This causes the comet to develop a coma, or atmosphere, up to 100,000 km across.

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How big is Halley's Comet?

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