Why does this scare me .
On Sunday evening, observers finally may have answers to some of these celestial questions. At 10:52 p.m. PDT, a NASA spacecraft the size of a wine barrel is scheduled to slam into the Tempel 1 comet at roughly 23,000 mph.
The impact, projected to leave a crater that could swallow a football stadium, is intended to scrape away part of Tempel 1's surface and expose what's underneath.
http://news.zdnet.com/Deep+Impact+pr...&subj=technews
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