Video: Comet close encounter
Scientists at Nasa had a late night close encounter for Valentines' Day, studying a comet at close range.
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Scientists at Nasa had a late night close encounter for Valentines' Day, studying a comet at close range.
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7 Mile-wide asteroid heading towards Earth poses greatest threat yet, scientists warn
8 Why women really do love self-obsessed psychopaths
9 The Big Question: Is time travel possible, and is there any chance that it will ever take place?
10 World oil supplies are set to run out faster than expected, warn scientists
11 Oregon's monster mushroom is world's biggest living thing
13 Video: Comet close encounter