Arecibo message beamed toward the M13 star cluster
- When
- Where
- Arecibo, Puerto Rico
- Sources
- 1 public source

At a ceremony marking an upgrade of the Arecibo radio telescope in Puerto Rico, scientists beamed a short pictorial radio message toward the globular cluster M13, about 21,000 light-years away. The SETI Institute notes a reply is unlikely ever to come.