M4 or NGC 6121 is a globular cluster in Scorpius. This cluster is 6,800 light years from Earth, 70 light years in diameter, and contains stars that are roughly 10 billion years old. A bright band of stars can be seen cutting through the center of the cluster.

July 6, 2002, 11:00 pm
Onizuka Visitor Information Station, Mauna Kea, Hawaii.

Takahashi FSQ-106, f/5
Luminance 180s, Red 120s, Green 120s, Blue 192s