A mysterious interstellar radio signal has been blinking on and off every 22 minutes for over 30 years

“We used the Murchison Widefield Array radio telescope in Western Australia to scan our Milky Way galaxy every three nights for several months. Almost as soon as we started looking, we found a new source, in a different part of the sky, this time repeating every 22 minutes… Our object looked a lot like a pulsar, but spinning 1,000 times slower…”

Natasha Hurley-Walker