Observations don’t match the predictions of the standard model—and it’s not just a fluke.

All the tools for measuring it in the local, recent Universe give fairly consistent results, around 72 to 74 kilometers per ...

One issue is that when scientists calculate what the Hubble constant should be, it doesn’t quite match observations of the ...

In the grand puzzle of the cosmos, one question continues to defy easy answers: how fast is the universe expanding? Astronomers have tried two main methods to figure it out, but their numbers don’t ...

The universe is expanding, and physicists cannot agree on how fast. In a preprint posted in late May 2026, the H0 Distance ...

A comprehensive new study combines decades of research to reveal that we're missing an essential component in our ...

Using a new framework, astronomers arrived at the most precise measurement of our universe’s expansion rate—but things still ...

A major international effort has produced an ultra-precise measurement of the Universe’s expansion rate, confirming it’s ...

The cosmological constant is the mathematical description of the energy that drives the ever-accelerating expansion of the ...

Explore the Hubble tension debate as astronomers reveal conflicting expansion rates, challenging our understanding of the ...

The following is an extract from our Lost in Space-Time newsletter. Each month, we hand over the keyboard to a physicist or mathematician to tell you about fascinating ideas from their corner of the ...

Whatever dark energy is, explanations for it have less wiggle room following a Hubble Space Telescope observation that has refined the measurement of the universe’s ...