Messier 10 is a bright and beautiful globular star cluster that anchors the center of Ophiuchus, the Serpent Bearer. You can find this stellar metropolis sitting about halfway between the stars Zeta and Beta Ophiuchi, sharing this stretch of sky with its nearby twin, M12. In a pair of 10×50 binoculars, M10 is an easy catch, showing up as a large, round, glowing ball of cosmic fuzz that stands out clearly against the dark background.
Through a small 4-inch telescope, the cluster becomes an enchanting target. The bright, compact core is surrounded by a large, grainy halo that fades out gently into space. Under high power, the edges begin to sparkle as individual stars start to break free from the misty background cloud. The core itself has a slightly irregular shape, giving the cluster a lively, dynamic personality at the eyepiece.
An 8-inch telescope fully transforms M10 into a glorious showcase of diamond dust. Dozens of bright stars scatter across the entire field of view, while the dense center sparkles with countless smaller suns. You will easily notice delicate, curvy chains of stars that seem to dance away from the core, making it look like a celestial fireworks display frozen mid-burst in the deep night.