Scientists Have Been Sending Signals to The Moon. They Finally Got One Back – ScienceAlert

When NASA’s Lunar Reconnaissance Orbiter (LRO) arrived in orbit around the Moon in 2009, scientists immediately started firing lasers at it.
More specifically, they were firing lasers at a small reflector array roughly the size of a paperback book, trying to bounce light back to Earth. And after almost 10 years, they have finally succeeded.
It’s the first time photons have been successfully reflected back to Earth from a lunar orbiter. And it not only gives us a new way to perform measurements…

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