G - Physics
21
C
G21C 1/00 (2006.01) F21L 4/00 (2006.01) G03H 1/00 (2006.01) G21H 7/00 (2006.01) G21J 1/00 (2006.01)
Patent
CA 2431798
Shined a flashlight on a distant galaxy. Seen a flashlight shine back. Pointed it another direction and seen other flashlights on different angles. This proved the galaxies are all the same.
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