The ESA's Proba-V satellite (Image: ESA)
When it comes to keeping tabs on the location of aircraft, radar has long ruled the roost. But radar range is limited, and long-haul planes become untraceable when passing over oceans and large deserts or polar regions. By equipping orbiting satellites with instruments that listen in on ADS-B signals, scientists think that it should possible to track aircraft over the course of their entire journey, and with the launch of Proba-V, they're ready to put the idea to the test.
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