NASA's Juno spacecraft to become fastest man-made object as it slingshots around Earth towards Jupiter
At 3:21 p.m. (EDT), NASA'S Juno Mission spacecraft will slingshot around Earth towards Jupiter, accelerating to 25 miles per second along the way and becoming the fastest man-made object in history. A .50-caliber bullet travels at about half a mile a second, by contrast - nowhere near the blistering speed of Juno.
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