NGC 3521, also known as the Bubble Galaxy, is a fascinating spiral galaxy located about 40 million light-years away from Earth in the constellation Leo. A Flocculent spiral, unlike some galaxies with grand, winding arms, NGC 3521 has shorter, irregular arms with patches of star-forming regions scattered throughout. This "woolly" appearance gives it the nickname "Bubble Galaxy." Surrounding the galaxy is a faint, bubble-like structure thought to be formed by debris and stars ripped from smaller galaxies by NGC 3521's gravity. While faint, NGC 3521 has a hint of a central bar structure and a weak inner ring, adding to its complexity.