AmericaSpace Launch Countdown

Next Launch SMAP on a Delta II 7320 rocket from Vandenberg AFB, CA
scheduled for:
29 Jan 15 14:20:42 GMT
29 Jan 15 6:20:42 PST
29 Jan 15 9:20:42 Eastern

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The Menace of the Asteroids. Part 1: The Risks

Artist’s impression of an asteroid approaching the Earth. Image Credit: Jeff Darling

Of the several hundred thousand asteroids known, about 9,000 are of the near-Earth variety, and of these more than 1,300 fall into the category known as potentially hazardous asteroids (PHAs). To qualify as a PHA, an asteroid must be able to come […]