We don't merely have the Hubble tension to reckon with, or the fact that different methods yield different values for the expansion rate of the Universe today, but a puzzle over whether dark energy is truly a constant in our Universe, as most physicists have assumed since its discovery back in 1998. While "early relic" methods using CMB or baryon acoustic oscillation data favor a lower value of around 67 km/s/Mpc, "distance ladder" methods instead prefer a higher, incompatible value of around 73 km/s/Mpc.
Using some of the world's most powerful telescopes, a team of researchers found more than 280 galaxies stretched in a line through the cosmos. These galaxies are studded throughout a vast filament of gas and dark matter, which is turning on its central axis like a giant cosmic 'rolling pin'. The researchers say that this filament, and the hundreds of galaxies inside it, is spinning at speeds over 246,000 miles per hour (396,000 km/s).