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Its story

The crane of the southern sky, Grus, holds this cool red M-class star 919 light-years away. M stars burn with a low warmth, almost a whisper of red light, but they can swell to staggering sizes. The light arriving tonight set out when the Normans were invading England at the battle of Hastings and a comet was crossing the sky —the one Halley would identify six centuries later—.