Check how Open Cluster Cr 21 would look like through your camera, eyepiece or binoculars.
This tool was designed to check framing, not visual magnitude. Objects will look dimmer on your eyepiece and binoculars.
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Astronomy Quote of the Day
“There are no black holes - in the sense of regimes from which light can't escape to infinity. There are however apparent horizons which persist for a period of time.”
Stephen Hawking, 2014