The nucleus is estimated to be approximately 5 miles by 9 miles. When it is near the sun, such as when visible from earth, the tail forms and extends out a few million miles.
http://wiki.answers.com/Q/How_Big_is_Haley's_Comet
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how big the coma is, compared to the actual nucleus (100,000 miles vs. 15 miles) ... ; This image of the nucleus of Halley's comet comes from the Giotto spacecraft. Click on image for full size version (67K JPG); Image courtesy of JPL...
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www.windows.ucar.edu/tour/link=/comets/Halley_measureme...
www.windows.ucar.edu/tour/link=/comets/Halley_measurements.html
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The image shown is a view of the nucleus of Comet Halley taken by the Giotto spacecraft. Below is a table of information on selected comets, and at the bottom of the page are comments on the comets.
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nssdc.gsfc.nasa.gov/planetary/factsheet/cometfact.html
nssdc.gsfc.nasa.gov/planetary/factsheet/cometfact.html
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There was a photo of Halley's comet, pale hair stretched across the stars. It was pure beauty. ; Hairy stars! Tresses of light, blown by the Sun ... (In fact, an old star blowing its top, as five billion years ago a nearby big fat blue star went off the deep end and sent a shock wave through a mess of cosmic dust and rubble,
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www.panterraweb.com/comet.htm
www.panterraweb.com/comet.htm
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The Orbit of Halley's Comet ... The following figure shows the orbit of Halley's Comet and its predicted location in 2024 relative to the orbits of the planets. ... Halley's Comet in 2024...
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csep10.phys.utk.edu/astr161/lect/comets/halley.html
csep10.phys.utk.edu/astr161/lect/comets/halley.html
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Space.com explains a comet, comets, halleys comet, comet search and halley's comet. ... » Water Ice Detected on Comet's Surface ... » Crash Day: A Blow by Blow Account of Deep Impact's Comet Smash...
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www.space.com/comets/
www.space.com/comets/
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It may be your only chance to see Halley's Comet. "The comet won't be visible from the Northern Hemisphere unless you really go out of your way." says programmer and amateur astronomer Jeff Mehlman. But with Mehlman's Halley Patrol, the comet will be visible on your Atari. ... "The world is a big place, and even college...
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www.atarimagazines.com/v4n6/comet.html
www.atarimagazines.com/v4n6/comet.html
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Astronomy.com is for anyone who wants to learn more about astronomy events, cosmology, planets, galaxies, asteroids, astrophotography, the Big Bang, black holes, comets, constellations, eclipses, exoplanets, nebulae, meteors, quasars, observing, telescopes, NASA, Hubble, space missions, stargazing, and more. ... In Halley's dust;
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www.astronomy.com/asy/default.aspx?c=a&id=6882
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On the other hand, Halley's Comet of 1985/86 was different - first, it was not so impressive, and second, it wasn't discovered by Edmund Halley. ... In ancient times, their sudden appearance was thought to indicate the arrival of calamitous events, such as plague, flood or death of some Big Wig.
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www.abc.net.au/science/articles/2007/05/17/1925307.htm?...
www.abc.net.au/science/articles/2007/05/17/1925307.htm?site=science/greatmomentsinscience
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