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" ... But one of the key challenges is keeping your entire telescope steady and accurate in how it's pointed. To that end, the Hubble Space Telescope was designed to lock onto a target and hold its position steady to precisions of just 0.007 arcseconds. To understand how impressive that is, that's the equivalent of shining a laser beam onto a quarter and hitting George Washington's eye, without fail, from a distance of 14 kilometers (8.7 miles) away. ... "