Giant Star Blows a Glowing Space Bubble | Wired Science | Wired.com
Called the Bubble Nebula, this eerie, translucent sphere is created by fierce winds from a superhot star 40 times the size of our sun. Moving at nearly 4.5 million miles per hour, stellar winds whip the cloud of gas around the star into a near-perfect bubble, which stands out from the rest of the more stationary gas in this emission nebula.