
The Bubble Nebula is a giant, near-perfect sphere of glowing gas about 7 light-years wide, sculpted by the fierce stellar wind of a single super-hot star roughly 45 times the mass of our Sun. NASA and ESA chose it as the showcase image to celebrate the Hubble Space Telescope's 26th anniversary in 2016, making its delicate cosmic soap-bubble shape one of the most recognizable sights in the night sky.