Astronomers can classify satellites by watching how they block stars

The satellite population in low Earth orbit (LEO) is not an open book. While data on many satellites is public, others are shrouded in secrecy, and information is incomplete for others. New research shows how observers can determine satellite shapes by watching them occult background stars. There are thousands of satellites in LEO, a region defined as below an altitude of 2,000 km (1,200 mi). More

(Source: Phys.org - May 21)