The Hubble constant: a mystery that keeps getting bigger
Astronomers have reached a fundamental impasse in their understanding of the universe: they cannot agree how fast it is flying apart. And unless a reasonable explanation can be found for their differing estimates, they may be forced to completely rethink their ideas about time and space. Only new physics can now account for the cosmic conundrum they have uncovered, many believe.
“Five years ago, no one in cosmology was really worried about the question of how fast the universe was expanding. We took it for granted,” says astrophysicist Daniel Mortlock of Imperial College London. “Now we are having to do a great deal of head scratching – and a lot of research.”
This view is backed by the US astrophysicist and Nobel prize winner Adam Riess, of Johns Hopkins University. “I think this issue has become a big deal. We were getting better and betterat understanding the universe and yet the closer we have been looking, the more we have found there are all these mysterious components.”
这一观点得到了美国天体物理学家、约翰·霍普金斯大学（Johns Hopkins University）的诺贝尔奖获得者亚当·里斯（Adam Riess）的支持。“我认为这个问题已经成为一个大问题。我们对宇宙的了解越来越深入，但我们越看越近，就越发现这些成分的神秘。”
Over the decades, these surprises have included the discovery of dark matter – believed to be made up of as yet undetected particles – whose extra gravitational pull explains why galaxies do not fly apart. In addition, astronomers have also discovered the existence of dark energy, which is accelerating the rate at which the cosmos is expanding.
Read more at The Guardian