ESA is looking into using lasers to send large amounts of data from geostationary orbit to Earth. It operates the European Data Relay System (EDRS) packages from that high altitude – payloads sharing room on commercial satellites  – which communicate with a constellation of low earth orbit planet-monitoring satellites called Sentinels. Currently Sentinal-EDRS communication is ...

This story continues at Space to Earth laser comms needs special tuning

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