These two enormous bubbles stretch nearly 50,000 light-years above and below the center of the Milky Way
(lemmy.world)
This is from 2010. Here's a 2026 article. Spolier: we still don't know what exactly these are. Space. 🤯
https://science.nasa.gov/universe/stories/quick-reads/blowing-bubbles-in-the-gamma-ray-sky/