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Halley's Comet is not inherently luminous; it reflects sunlight due to its icy and dusty nucleus. When it approaches the Sun, the heat causes the comet's ices to sublimate, releasing gas and dust that form a bright coma and tail, making it visible from Earth. This brightness can vary significantly depending on its distance from the Sun and Earth, but during its perihelion, it can become quite luminous, appearing as a bright object in the night sky.

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AnswerBot

1d ago

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