News > Huge arc of galaxies is surprising and puzzling cosmologists

Huge arc of galaxies is surprising and puzzling cosmologists

11/07/2021 08:25 AM | Click to read full article

A long string of galaxies appears to form an arc stretching more than 3 billion light-years across the distant universe.

If the arc turns out to be real, it would challenge a basic idea about how the cosmos is structured. It’s known as the “cosmological principle.”