Do you like blowing bubbles? So does our Milky Way galaxy—although these bubbles might be a little bigger than what you’re used to. Two bubbles, each 25,000 light-years tall, are extending above and below the disk of the galaxy like the two halves of an hourglass. Discover possible explanations for these bubbles: https://nasa.tumblr.com/post/179690202529/blowing-bubbles-in-the-gamma-ray-sky
