'Playing Roulette with the Earth:' Dr Ed Lu on Asteroid Near Valentine's Day

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'Playing Roulette with the Earth:' Dr Ed Lu on Asteroid Near Valentine's Day

'Playing Roulette with the Earth:' Dr Ed Lu on Asteroid Near Valentine's Day
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'Playing Roulette with the Earth:' Dr Ed Lu on Asteroid Near Valentine's Day

by ABC News Videos

If it hit, asteroid would be big enough to take out area the size of Washington, D.C.

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