February 15, 2007C
omets are colliding and kicking up dust around a dead star, according to new observations from NASA's Spitzer Space Telescope. The dead star lies at the Helix Nebula's center, a shimmering cloud of gas with an eerie resemblance to a giant eye.
In this week's podcast, Kate Su, lead author of a paper on this discovery, discusses what's going on in the Helix.
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