The Universe Seems To Be Expanding Faster Than All Expectations
In recent years, numerous studies have shown that measurements of the Hubble constant from the cosmic microwave background—the faint afterglow of the infant universe—are at odds with estimates from far younger stars, such as those in our Milky Way, even after taking into account other mysterious cosmic forces such as dark energy, which is accelerating the universe’s expansion. But based on fresh measurements of our cosmic neighborhood from the Hubble Space Telescope, Riess and his colleagues say that the mismatch is not only real, it’s wider than ever. Calculating the Hubble constant, and thus the expansion rate of the universe, based on the movements of stars requires two kinds of data: how far away a given star is, and how quickly it’s receding from us.
Source: www.nationalgeographic.com