On Feb. 15, asteroid 2012 DA14, discovered a year ago, cleared Earth by a scant 17,200 miles. The same day, a smaller, unrelated asteroid that no one saw coming exploded 12 to 15 miles above Russia’s Chelyabinsk region. Events that day highlight the risk that near-Earth objects (NEOs) can pose – although to some extent, humans can counter them.
Landfall for tropical storm Karen is projected for early Sunday morning just east of Mobile, Ala. But forecast uncertainties mean it could come ashore anywhere from the New Orleans area to Indian Pass, Fla.
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