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The sky that suddenly stopped being eternal November 1572. The constellation Cassiopeia. On what seemed like an ordinary night, a star flares up in a place where no star had ever been. It shines so brightly that it remains visible even in the daytime against the pale autumn sky. For people of that era, this was not just an astronomical event. It was a blow to their entire picture of the world. The stars were believed to be unchanging and perfect — an eternal sphere untouched by earthly change. And yet here, right before everyone’s eyes, a “new star” appeared and broke all the rules. The German astronomer Wolfgang Schuler was the first to notice it, on November 6, 1572, simply by looking up. But the outburst became truly famous thanks to the Danish astronomer Tycho Brahe. He carefully observed it, measured its position and brightness, and soon published a book titled *De nova stella* (“On the New Star”). Because of him, the event entered history as Tycho’s Supernova. The brilliant guest remained visible during the day for about two weeks and could be seen with the naked eye for a full 16 months. Gradually it faded and finally disappeared. Today we know it was SN 1572 — a classic Type Ia supernova roughly 13,000 light-years away. A white dwarf that had been pulling material from a companion star reached a critical mass and detonated. And the sky still hasn’t settled down. Right now astronomers are closely watching the star T Coronae Borealis. It may erupt at any moment as a nova — a less powerful event than a supernova, after which the star survives. But even such a flare would remind us of the same lesson Tycho’s Supernova once taught: the heavens are not eternal. They change. And sometimes they do it right before the eyes of all humanity.