The Great Attractor

When we look at the motion of the galaxies closest to our own, the Milky Way we see something strange. They all seem to be - along with our own - pulled to a point in space about 150 million light years away. We don't know what it is. Because it is on the other side of the center of the Milky Way from us, in a direction called the 'Zone of Avoidance', behind so much dusts and stars, we cannot see it.
This mysterious object pulling us towards it is called the 'Great Attractor' and was first observed in the 1970s.
As we started to investigate, using more of the electromagnetic spectrum - x rays and radio - we could start to see objects within that region. What we found was a large supercluster of galaxies in the area of the Great Attractor, we found a large collection of galaxies in the area of the Great Attractor, with a mass of about 1,000,000 billion Suns called the Norma Cluster.
Even more strange, the Great Attractor just isn't great enough, and our local galaxies and the Great Attractor itself, are being pulled towards something even greater.
This even greater thing is now called the Shapley Supercluster, containing more than 8000 galaxies and has a mass of more than ten million billion Suns. The Shapley Supercluster is, in fact, the most massive galaxy cluster within a billion light years, and attreacts everything in our region of space.