Laser beam from the Moon to Earth

By the time the signal is analysed by scientists at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR), it will have travelled roughly 400,000 kilometres and passed through Earths atmosphere. They discover that: “The atmosphere has a less pronounced influence than expected; the signal quality is very good,” says Dirk Giggenbach from the DLR Institute of Communications and Navigation.

Read more at dlr.de or at nasa.gov.