A laser beam's path through NASA's ICESat-2
Wednesday, June 17, 2015 - 06:50
in Astronomy & Space
Before beaming 300 miles to Earth's surface, bouncing off the ground and travelling another 300 miles back into space, the laser photons on NASA's Ice, Cloud and Land Elevation Satellite-2 first have to complete a 7½-foot obstacle course inside the satellite's instrument.