#SkyWatch #Astrophotography Yesterday's daily photo was a crop of this one which shows the #Bubble Nebula on the right and the open star cluster #M52 on the left. M52 is a large star cluster in the #Cassiopeia constellation. The central portion of the cluster shows very little interstellar matter. The current theory is that this matter was blown away by many supernova explosions early in the life of the cluster. The cluster is estimated to be more than 150 million years old. #StillLearning

M52

Magnitude 7.3 open cluster located 4,600 light-years away in the constellation Cassiopeia. It was discovered by Charles Messier in 1774.

#astrophotography #astronomy #space #unistellar #citizenscience #m52 #cluster #cassiopeia #messier #messiermarathon