In a fascinating
2014 study for
Nature, a team of scientists mapped thousands of galaxies in our immediate vicinity, and discovered that the Milky Way is part of a jaw-droppingly massive "supercluster" of galaxies that they named
Laniakea.
What's interesting is that this structure is much bigger than anyone had realized. Astronomers had long grouped the Milky Way, Andromeda, and other galaxies around us in the
Virgo Supercluster, which contained some 100 galaxy groups.
It's hard to wrap one's head around how enormous this is. Each of those points of light is an individual galaxy. Each galaxy contains millions, billlions, or even
trillions of stars. Oh, and this all is just our little local corner of an even broader universe. There are many other galaxy superclusters out there.
But as Tully and his colleagues found, and as the map above shows, this Virgo Supercluster is just part of a much, much bigger supercluster — Laniakea. (The name, aptly enough, means "immeasurable heavens" in Hawaiian.)
So what happens when we zoom out? The paper notes that Laniakea borders another supercluster known as Perseus-Pisces. And the scientists defined the borders as where the galaxies are consistently diverging: