You read it right, a bubble in space. It’s the Bubble Nebula, also called NGC 7635. It’s an H II region (region of star formation), but what led to that shape? There is a massive, hot, young star at its center, and the bubble is created by stellar wind from this star. It was discovered by William Herschel in 1787. The star SAO 20575 is thought to have a mass of 10- 40 solar masses. With an 8- or 10-inch (250 mm) telescope, the nebula is visible as an extremely faint and large shell around the star.

The universe is full of surprising and amazing shapes. It’s an artist, which is limitless and has no boundaries to its art.