Galaxies residing in a huge filament of dark matter have been found to be mostly rotating in the same direction that the filament is spinning. It's a discovery that challenges what astronomers think they know about how the environment influences galactic evolution.
The filament is a thread in the cosmic web, which is made of mostly dark matter and laced with ordinary matter, that spans the entire universe. Located 140 million light-years away, the filament has a nested structure. At its heart is a row of 14 galaxies almost precisely placed in a line 5.5 million light years long and 117,000 light-years wide, and all are rich in hydrogen gas that's required for forming stars. This row of galaxies is then embedded in the larger filament that's 50 million light years in length and is home to about 300 galaxies in total.
