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Cosmologists Debate How Fast the Universe Is Expanding
New measurements could upend the standard theory of the cosmos that has reigned since the discovery of dark energy 21 years ago.
A Radically Conservative Solution for Cosmology’s Biggest Mystery
Two ways of measuring the universe’s expansion rate yield two conflicting answers. Many point to the possibility of new physics at work, but a new analysis argues that unseen errors could be to blame.
Solution: ‘Triangulation and Motion Sickness’
A method for estimating distances in sailing and astrophysics helps explain why riding on buses and boats can make us nauseous.
How Triangulation Leads to Knowledge
What does measuring distances in sailing and astrophysics have to with motion sickness?
Colliding Neutron Stars Could Settle the Biggest Debate in Cosmology
Newly discovered “standard sirens” provide an independent, clean way to measure how fast the universe is expanding.