The Great Attractor is a region of space that's pulling our galaxy, the Milky Way, and many others towards it. It's located about 250 million light-years away.
Scientists have been studying the Great Attractor since the 1970s, but its exact nature remains a mystery. It's thought to be a large, unseen mass of dark matter or a collection of galaxies that are pulling everything towards them. The Great Attractor is just one of many similar regions of space that are pulling on our galaxy, but it's the strongest one we've found so far.