A series of images taken by Hubble shows a star blowing a massive bubble in space. Nicknamed the “Bubble Nebula,” it spans about 7 light-years across. The star creating the bubble is about 45 times the mass of our sun.
The star is so hot that it's producing stellar winds traveling at 4 million mph. "This outflow sweeps up the cold, interstellar gas in front of it, forming the outer edge of the bubble much like a snowplow piles up snow in front of it as it moves forward," NASA explains.
The nebula sits about 7,000 light-years away from our galaxy, and it's illuminated by the intense UV radiation coming from the star. The blue light represents oxygen.
Here’s why the bubble is forming.