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APOD: 2007 March 31 - Hale-Bopp: The Great Comet of 1997
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Apod: 2007 march 31
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Amazing Astronomy : Halley's Comet
The course of Halley's Comet across the night sky through April and May
Halley's Comet
Halley's comet – orbit around the sun, short period comet, next return
APOD: 2007 March 31 - Hale-Bopp: The Great Comet of 1997
Fantastically Wrong: That Time People Thought a Comet Would Gas Us All