Meet the dipole repeller.
. There's Andromeda, 2.5 million light-years away, which everyone knows and loves. There's also Triangulum, which nobody really cares about. Our three galaxies and a few dozen dwarf galaxies combine to form the Local Group, which is a very unassuming name for a structure a few million light-years across.
The nearest big deal to our Local Group is the Virgo Cluster, a massive ball of over a thousand galaxies sitting 60 million light-years away. Our Local Group and other groups in this patch of space aren't part of the Virgo Cluster itself; rather, they belong to a greater structure known as the Virgo Supercluster.have decent, understandable definitions: They are gravitationally bound.
It's like a population census trying to define a metro area: Sure, there are the city limits, but what about all the people living near a major city and working in it? Where, exactly, does it stop?Despite these varied definitions, we can draw some general outlines. The Virgo Supercluster appears to be just one branch of an even larger supercluster called Laniakea.
The superclusters are like the foam you see when you add too much soap to your bath. We're just giving different parts of that foam network cool names. But between all those bits of foam are vast, empty regions. In your bath, those empty pockets are the soap bubbles themselves. InEvery supercluster defines the edge of a corresponding cosmic void. There's the Sculptor Void, the Canis Major Void, the Boötes Void and more.
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