A few years ago, probably during lockdown, I watched the excellent Netflix documentary Black Holes: The Edge of All We Know about the Event Horizon Telescope and the effort to photograph the supermassive black hole at the centre of galaxy M87. Black holes have always captivated me ever since, as a wee lass, science and science fiction came on my radar. How could they not? So even though Marcus Chown is a new-to-me science writer,…