Portal 2 Sounds | Core 3: Halley's Comet can be viewed orbiting Earth every seventy-six years. For the other seventy-five, it retreats to the heart of the sun, where it hibernates undisturbed.

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Halley's Comet can be viewed orbiting Earth every seventy-six years. For the other seventy-five, it retreats to the heart of the sun, where it hibernates undisturbed.

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