"Milky Way Galaxy" by Nick Risinger / Public Domain

Beyond the Milky Way, a Galactic Wall

Jul 10, 2020

By Dennis Overbye

Astronomers have discovered that there is a vast wall across the southern border of the local cosmos.

The South Pole Wall, as it is known, consists of thousands of galaxies — beehives of trillions of stars and dark worlds, as well as dust and gas — aligned in a curtain arcing across at least 700 million light-years of space. It winds behind the dust, gas and stars of our own galaxy, the Milky Way, from the constellation Perseus in the Northern Hemisphere to the constellation Apus in the far south. It is so massive that it perturbs the local expansion of the universe.

But don’t bother trying to see it. The entire conglomeration is behind the Milky Way, in what astronomers quaintly call the zone of avoidance.

An international team of astronomers led by Daniel Pomarède of Paris-Saclay University and R. Brent Tully of the University of Hawaii announced this new addition to the local universe on Friday in a paper in Astrophysical Journal. The paper is festooned with maps and diagrams of blobby and stringy features of our local universe as well as a video tour of the South Pole Wall.

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