“Holy sharks, Batman, it’s periodic!” I exclaimed on Slack. It was the first lockdown of 2021 in Perth, and we were all working from home. And when astronomers look for something to distract themselves from looming existential dread, there’s nothing better than a new cosmic mystery. In 2020, I gave an undergraduate student, Tyrone O’Doherty, a fun project: look for radio sources that are changing in a large radio survey I’m leading. By the end of the year, he’d found a particularly unusual source that was visible in data from early 2018, but had disappeared within a few months. The…
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