Jocelyn Bell's radio signal that led to the discovery of pulsars.
https://files.mastodon.social/media_attachments/files/109/424/467/766/170/183/original/1da03ac6b73ed47c.jpg
55 years ago #today Jocelyn Bell discovered the first known pulsar -- a star the size of a city, spinning once a second, whipping up intense radio signals that sounded like the beep-beep-beep of an alien signal.
In her own words: https://www.cam.ac.uk/stories/journeysofdiscovery-pulsars #astronomy #discovery
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