kan iemand me dit uitleggen? ik vond het bij google earth (Canis Maior)
Op internet kun je de uitleg vinden door te googlen op bijvoorbeeld "google-earth blue-artifact".
1:
Look for a round blue object between Sirius and Orion, sitting just above Sirius, and zoom in on it, until you see this. That is the underside of the telescope at Palomar. It is an image that appears on the original photographic plates, and is a result of a double-exposure or light leak onto the plate. The plate was not discarded because it was felt that the data was not obscured enough, and was too valuable to discard. There are several of these in the DSS data, along with some other interesting imaging artifacts.
Elders wordt gesuggereerd dat het een interne reflectie in de telescoop is
van de zeer heldere ster Sirius.