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Its story

In Canis Major, where Sirius reigns unchallenged, a blue variable star pulses with an almost imperceptible beat. Its light began its journey 863 years ago, when the first stones of Notre-Dame de Paris were being laid and the Provençal troubadours were inventing modern love poetry. Far hotter than the Sun, its brightness shifts in time like a deep, slow breath, reminding us that no star is wholly unchanging.