Explanation: What are these Earthlings trying to tell us? The featured message was broadcast from Earth towards the globular star cluster M13 in 1974. During the dedication of an upgrade to the Arecibo Observatory - then the largest single radio telescope in …
Skip to comments.
Astronomy Picture of the Day - A Message from EarthNASA ^
| 29 Mar, 2026
| Image Credit: Frank Drake et al., Arecibo Observatory; License: Arne Nordmann (Wikimedia)
Posted on … [+2139 chars]
