Space looks calm, but actually our own galaxy, the Milky Way, is traveling through the cosmos at 2.2 million km an hour. This is a bit of a mystery. According to our ideas about the Big Bang, everything in the Universe should be flying apart at similar speeds. If everything is moving at similar speeds, it should look like nothing is really moving at all. When some objects seem to be moving faster than others, it’s usually because clumps of matter like galaxy clusters are exerting an additional gravitational pull. But we know of nothing close to the Milky Way that explains its drift — we just know that something must be causing it. Astronomers named the mysterious clump of matter we haven’t found yet “The Great Attractor”.
Keishinrei 