Derrick Pitts, chief astronomer and planetarium director for the Franklin Institute in Philadelphia, talks to the "CBS This Morning" co-hosts about the close-approaching QE2 asteroid and a ... more 
Derrick Pitts, chief astronomer and planetarium director for the Franklin Institute in Philadelphia, talks to the "CBS This Morning" co-hosts about the close-approaching QE2 asteroid and a 10,000-year-old woolly mammoth carcass. less 
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Fri, May 31, 2013 2:56 PM EDT