Aug 10, 2020. Article. Dozens of times over the last decade NASA scientists have launched laser beams at a reflector the size of a paperback novel about 240,000 miles (385,000 kilometers) away from Earth. They announced today, in collaboration with their French colleagues, that they received signal back for the first time, an encouraging result.. To time how long it takes a pulse of laser light to travel from space to Earth and back, you need a really good stopwatch — one that can measure within a fraction of a billionth of a second. That kind of timer is exactly what engineers have built at NASA's Goddard Space Flight Center in Greenbelt, Maryland, for the Ice, Cloud and land.
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It calls for a ground-based laser array on the order of 0.4 square miles (1 square kilometer) and as powerful as 100 gigawatts, which would be by far the most powerful laser ever made on Earth.. The ED 50 distance is 0.316 times the NOHD (a little less than 1/3 the NOHD distance). At the ED 50 distance, there is roughly a 50-50 chance that a fixed laser beam aimed into an unmoving eye under laboratory conditions will cause the smallest medically detectable change to the retina. Such small changes can heal — just as small skin cuts and burns can heal with no adverse effect.
