They are the great nebula in Orion, and the star cluster in Hercules.
The star cluster 4681 is a fine sight with our largest glass.
No one has ever succeeded in measuring the parallax of a nebula or star cluster.
The star cluster 4608 is small, yet, on a moonless night, worth a glance with the five-inch.
The star cluster 4400 is about one quarter as broad as the moon, and ...