In that event,astronomers were able to observe the icy comet long before it struck the solar system's biggest planet.

VOA: special.2009.08.25

Sometimes,observers see this as a comet's tail, which can be visible to the unaided eye stretching across the night sky.

VOA: special.2011.02.09

One argument against the comet theory is that a comet would have left a large hole in the Earth's surface.

VOA: special.2009.01.20

It's never happened before that we've fired a very large bullet that's made largely of copper and aluminum, the size of a washing machine, at a comet that's about--the comet's nucleus is about four or five miles across--to make a big crater.

NPR: NASA 'Deep Impact' Probe Targets Comet

The company was swamped by demand following the offer, which was made through Kingfisher's Comet and Woolworth's stores, and was forced to limit access for some subscribers.

BBC: Italy's Tiscali buys Liberty Surf

What's the view like from inside a nebula, or a comet's tail?

ENGADGET: Initial projects from 3net Studios include the world's first native 4K TV show