Scientists have used radio telescopes to cut through the haze of the Milky Way, revealing hundreds of previously hidden galaxies lurking behind it.
Researchers from Australia, South Africa, the United States and the Netherlands report that the galaxies — relatively close, in cosmic terms, at just 250 million light years away — could help explain a mysterious gravitational phenomenon known as the Great Attractor.
The area of sky obscured by our own galaxy’s mass is called the Zone of Avoidance, which admittedly sounds like a location name from a tabletop role-playing game. The ZoA covers about 20 percent of the sky, and scientists know it’s full of cosmic objects. But because the dust of our own galaxy obstructs our view (and the bright stars in the area make it hard to see distant ones shining) it seems like a void when you look at it with optical telescopes.
Enter the Great Attractor: This is a region of space that sits beyond the Milky Way and pulls all nearby galaxies toward it. Scientists know it must be incredibly massive to exert that kind of gravitational force, but because it’s obscured by the Milky Way, we don’t know much about it.
That’s more than 1.2 million mph. Staveley-Smith and his colleagues believe that this bumper crop of new galaxies could help solve the mystery: Perhaps there are enough of them in the ZoA to collectively exert huge gravitational forces.