Due to Easter Weekend, we are celebrating Messier Monday a day later than usual this week. But as always, this latest installment is in honor of our dear friend and contributor Tammy Plotner. In the 18th century, French astronomer Charles Messier kept noting the presence of fixed, diffuse objects in the night sky. At the … Continue reading Messier 9 (M9) – The NGC 6333 Globular Cluster