near Earth object

How Sentinel Will Hunt for Hidden Asteroids

by Jason Major June 5, 2014

Asteroids of various sizes whiz past our planet all the time. Some we know about, but many we don’t, and new ones are identified on an almost weekly basis. (In fact one such recently-discovered asteroid named 2014 HQ214, an object the length of an aircraft carrier, will pass us at a mere 3 lunar distances […]

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A Parting Look at 2012 DA14: Was This a Warning Shot from Space?

by Jason Major February 18, 2013

Just as anticipated, on Friday, Feb. 15, asteroid 2012 DA14 passed us by, zippingĀ 27,000 kilometers (17,000 miles) above Earth’s surface — well within the ring of geostationary weather and communications satellites that ring our world. Traveling a breakneck 28,100 km/hr (that’s nearly five miles a second!) the 50-meter space rock was a fast-moving target for […]

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