Tag Archives: Arecibo Message

The Hercules Cluster

The Hercules Cluster (M13) is located between the two western stars of the Keystone Asterism that represents Hercules’ head. M13 is about 25,100 light years from Earth, and was the target toward which the Arecibo message was beamed in 1974, or 40 years ago. This cluster is comprised of about 300,000 closely packed stars, can be seen with the unaided eye in a very dark sky, and it is easily located with binoculars or modest amateur telescopes. I have not tried, but I think that a camera set up described for the Virgo Cluster could easily capture this cluster.