The gamma-ray sky hosts a pair of gigantic galactic bubbles. The Fermi Bubbles were discovered in 2010, and scientists still aren’t sure what made them, when they formed, or why they appear so smooth. They remain a fascinating mystery! https://t.co/SpGzNMkqbJ #NoRhymeOrReasonDay pic.twitter.com/1dSNB6bPeE

— NASA Universe (@NASAUniverse) September 1, 2022