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Its story

In Sagittarius, that centaurean archer aiming at the heart of the Milky Way, burns a very hot, blue-tinted star of B type. Its light set out more than eight hundred and forty years ago, deep in the European Middle Ages, when the first sections of the cathedral of Notre-Dame in Paris were being raised. Far hotter and more luminous than the Sun, its violent blue tone is proper to young, powerful stars. It hangs like a forge spark among the densest star fields of the night sky, almost invisible to the naked eye yet burning fiercely.