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A globular cluster, 10 billion years old.
Only 7200 light years away, M4 may be the closest globular cluster to our solar system.
The bright red supergiant Antares is only 1.5° west of M4,
making it tough to see with the naked eye.
Binoculars reveal M4 as a very bright and round globular.
The cluster's core is loosely concentrated with a string of 10th magnitude and
fainter stars running across the center, partially obscured by clouds of interstellar matter.
A remarkable object in any instrument.
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