Our MESSENGER spacecraft, traveling at 3.91 kilometers per second (over 8,700 miles per hour), will collide with Mercury's surface at about 3:30 p.m. EDT today, creating a crater estimated to be 16 meters (52 feet) in diameter. The spacecraft achieved unprecedented success studying the planet. Details:http://go.nasa.gov/1Q3Bd7l
Tags: #NASA #space #Mercury
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