"A recharged debate over the speed of the expansion of the universe could lead to new physics", by Joshua Sokol, AAAS
Debate over the Hubble constant, the expansion rate of the universe, has exploded again. Astronomers had mostly settled on a number using a classical technique - the "distance ladder," or astronomical observations from the local universe on out. But these values conflict with cosmological estimates made from maps of the early universe and adjusted to the present day. "We don't know which way this is going to land," Wendy Freedman says.