How big can a nebula become?
Most nebulae can be hundreds of light years in diameter but the biggest ones can be from 600 000 ly (180,000 pc) to 2,600,000 ly (800,000 pc).
Nebula NGC 262 Halo Cloud is a spiral nebula surrounding NGC 262 an also the largest known nebula. NGC 262 Halo Cloud's size is equal to 2,600,000 ly (800,000 pc).
- NGC 262 is the largest known galaxy