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Halley's Comet |
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| Halley's Comet reappears approximately every 76 years; this photo, taken in New Zealand in 1986, shows the comet during its most recent pass by earth. Comets are only visible when near the sun because the intense solar radiation vaporizes parts of the icy nucleus, forming the comet’s coma and tail. | ||||||
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| Barney Magrath/Science Source/Photo Researchers, Inc. | ||||||
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| Appears in these articles: | ||||||
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| Comet; Astronomy, History of; Halley’s Comet; Vega (space program) | ||||||
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