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"The fundamental necessity of space security is knowing where every satellite is and how it is behaving. ’s June 2020 doctrine calls this “space domain awareness.” Officially that awareness comes via a global network of sensors on satellites and telescopes on the ground that covers all orbits all the time and tracks everything bigger than 10 centimeters: 3,200 live satellites, as well as 24,000 nonfunctioning “zombies” and pieces of space debris that, in a collision with a satellite at 35,400 kilometers an hour, would cause a catastrophic breakup. The information is sent to Space Force’s 18th Space Control Squadron at the Combined Space Operations Center at in California. Data on the secret satellites are set aside, and the rest go into a public, free, online catalog called Space-Track, from which “conjunction notifications” are issued when two satellites look like they might get too close."
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Ann Finkbeiner




