An arc of galaxies 3 billion light-years long may challenge cosmology
The discovery is a “big deal” if true, but still needs to be confirmed
Observations of thousands of galaxies taken by the Sloan Digital Sky Survey (pictured) helped reveal a purported giant arc of galaxies, more than 3 billion light-years long.
Patrick Gaulme/Sloan Digital Sky Survey (CC BY 4.0)