What Is a Comet Made Of?
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UC Davis -- A new method for looking at the composition of comets using ground-based telescopes has been developed by chemists at UC Davis. Remnants from the formation of our solar system, the makeup of comets gives clues about how the Earth and other planets formed...
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A nearby star thought to harbor comets and asteroids now appears to be home to planets, too. The presumed worlds are smaller than Jupiter and could be as tiny as Pluto, new observations suggest.
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Six months' abstinence worth hot widescreen action Electrical retailer Comet has confirmed what those of us who boast enormous plasma tellys already know - that when it comes to getting your rocks off nothing beats a bit of hot bloke-on-widescreen action.â¦
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For the first time ever, NASA is setting off on a collision course with a comet, in hopes of blasting a huge hole in the celestial snowball and gazing upon the original ingredients of the solar system preserved inside.
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Next Fourth of July, NASA will slam a heavy probe the size of a garbage can    into a comet, purposely carving a football-field sized crater for inspection.    As for&nbsp;what exactly&nbsp;will happen,&nbsp;however, nobody really knows.
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Did you know that about a hundred tons of space debris, including comet particles, falls to Earth each day? Read more facts on comet science and history.
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Fred Whipple, an astronomer who originated the idea that comets were comprised of ice and mineral dust, has died at the age of 97.
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By Perkins, Sid Did a comet blow up over
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The leading theory of how planets form is being revised because of new observations from the US Spitzer Space Telescope. The process is not as smooth and quiet as once thought, but rather the result of violent collisions between massive space rocks.
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The Genesis desert crash has left scientists wondering about the delicate condition of its solar wind collection. The first release of samples to the community has begun, while new tests for oxygen-isotopes may help uncover which particles might have lunar, solar or terrestrial origins.
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Tributes have been paid to astronomer  Fred Whipple who has died. He was the first scientist to describe comets as "dirty snowballs".
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NASA sets a rocket in motion toward a comet, hoping to gain knowledge of the comet's makeup.
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PROVIDENCE, R.I. -- Asteroids and meteorites are supposed to be made of the same stuff â at least that's what earth science teachers have been telling their students for decades. But until re-cently, the data didn't quite fit the story.
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Swift-Tuttle hosts the Perseids meteor shower, has an unusual orbit for a comet ... and there's something else about it, too.
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An explosion on a distant comet, Holmes, is studied by UK astronomers using the Isaac Newton Telescope.
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Two years ago, NASA's Deep Impact spacecraft blasted a hole in Comet Tempel 1, offering researchers their first look inside a comet.  One small problem:  The cloud of debris was so thick no one could clearly see the crater.  But now the dust has cleared and another NASA spacecraft is returning to the scene to examine the hole Deep Impact wrought.
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NASA's Opportunity rover has determined that a strange bubbly rock on the surface of Mars is actually a meteorite, offering a new clue into how the martian surface is made and remade.