It measures 130 to 300 feet across, a pebble compared to the asteroid that killed the dinosaurs, which is estimated to have been six to nine miles in length. On the other hand, on Feb. 15, 2013, an ...

The Valentine's Day northern lights will largely be visible in Canada and Alaska, but a few northern-most states may see the dazzling display, too.

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YR4 were to strike Earth, the energy released could be equivalent to 8 megatons of TNT, capable of devastating an area the size of Washington, D.C ...