New private 'Perceptor' probes will keep an eye on satellites high above Earth

Satellites high above Earth may soon have fewer places to hide.San Francisco-based company Astranis announced today (Aug. 13) that it's developing a line of spacecraft called Perceptor, which will keep an eye on satellite activity in geostationary orbit (GEO).GEO lies 22,236 miles (35,786 kilometers) above Earth, an altitude at which orbital speed matches our planet's rotational velocity. It's therefore a popular destination for communications, weather and reconnaissance spacecraft — and,