Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology. Different techniques for measuring the Hubble constant stubbornly disagree ...

A burst of light in the deep sky is doing something it should not be able to do. It looks like one supernova, but it shows up ...

An extraordinarily rare, gravitationally lensed supernova may offer a powerful new way to measure the universe’s expansion rate.

Summary: Cosmic voids may seem like the emptiest places imaginable, stripped of matter and radiation. Yet modern physics reveals that even these vast expanses are far from nothing. Cosmic voids are ...

For years, cosmologists have argued over a simple question with an awkward answer: How fast is the universe expanding right ...

A closer look at the Lambda Cold Dark Matter model, its core components, supporting evidence, and why new observations are ...

For decades, astronomers have known that the universe is expanding. To determine how fast it is growing today, scientists calculate a value called the ...

A physicist proposes that the universe is not empty space, but is a viscous fluid, fueling the expansion and contraction we see.

Dark energy, the mysterious force driving the accelerated expansion of the universe, has puzzled scientists since its discovery in 1998. Despite its elusive nature, dark energy is believed to ...

A proposed five-satellite Cosmic Positioning System could measure cosmic distances directly and help address discrepancies in the Hubble constant through solar system–scale triangulation.