Astronomers Just Detected an Enormous Ancient Galaxy Orbiting The Milky Way

By Michelle Starr Just as moons orbit planets, planets orbit stars, and stars orbit galactic cores, galaxies can be orbited by other, much smaller galaxies. The Milky Way has several of these hangers-on, most notably the Large and Small Magellanic clouds, the only two of our galaxy’s satellites visible to the naked eye. Now, thanks to Gaia data – …