This area of research and application is fascinating and, as the article alludes, will only become more important in the coming decades. I also read a related

This area of research and application is fascinating and, as the article alludes, will only become more important in the coming decades. I also read a related story[0] recently that others may find of interest: A hobbyist was able to track down a satellite whose EOL was supposed to be in _1972_ by using a beefed up HAM radio to scour the sky for its RF. [0] - https://www.npr.org/2020/04/24/843493304/long-lost-u-s-military-satellite-found-by-amateur-radio-operator https://www.npr.org/2020/04/24/843493304/long-lost-u-s-milit...