The Autonomous Nanosatellite Guardian for Evaluating Local Space (ANGELS) project is an Air Force Research Laboratory project to develop a small satellite which can orbit close to a larger spacecraft and monitor the local space environment.
- ↑ Singer, Jeremy (2005-11-30). "Air Force ANGELS: Satellite Escorts to Take Flight". Space.com. Archived from the original on 24 July 2008. http://web.archive.org/web/20080724045309/http://www.space.com/businesstechnology/051130_airforce_angels.html. Retrieved 2008-07-28.
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