According to the Guinness Book of Records, the biggest lion that ever lived was 11 feet long and weighed 600 pounds. Sure, it’s a pretty big cat, but it’s got nothing on the Frosty Leo Nebula.

This protoplanetary nebula is likely several lightyears across. To put this into perspective, one light-year is about 9.46 trillion kilometres. Now <i>that’s</i> a big cat. Thankfully, any astronauts that wander into its territory need not worry: it won’t bite. In fact, nebulae are really diffuse clouds of gas, so there wouldn't be much effect at all.

The Frosty Leo Nebula gets its name from its characteristic appearance, resembling a frosty cosmic lion. It’s also a rare sight for its molecular emissions, making it a prime target for studying the physics of space.