• Earths cloud layer – (~5 km) ~ .00002 light seconds
• Comet Holmes 17p – (~350,000,000 km) ~19.4 light minutes
• Pleiades – 440 light years
• Double Cluster in Cassiopeia – 7000 light years
• Andromeda Galaxy – 2,530,000 light years
All of those photon's reaching the camera at exactly the same instant.
DSLR – 20 seconds, ISO 800 from Leona Valley CA.