Space Photos of the Week: Hubble Captures the Bubble

Behold the Bubble Nebula. Photographed by the Hubble Space Telescope in the Perseus Arm of the Milky Way, it looks, well, like a giant space bubble. Astronomers pin the blame for this blowup on a hot, bright star called SAO 20575, seen near the center of the nebula. The stellar wind from this O-class star …

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