Supernovas show the universe expands at the same rate in all directions
An analysis of exploding stars reveals the universe’s symmetry
The cosmos doesn’t care whether you’re looking up or down, left or right: In all directions, the universe is expanding at the same clip. When compared across large swaths of the sky, expansion rates agree to better than 1 percent, researchers report in a paper in press in Physical Review Letters.
Observations of exploding stars, or supernovas, indicate that the universe is not only expanding, but that expansion is accelerating over time (SN Online: 1/16/18).