Dark energy may be the most mysterious substance ever proposed, but many scientists are certain it exists. Why?

Researchers in Germany argue that a modified theory of gravity could explain universal expansion, removing dark energy from ...

Our best models of the cosmos don't add up — but that could change if the universe is actually made of a viscous 'fluid,' a ...

In an unprecedented step, researchers crafted a detailed model compatible with the universe’s accelerated expansion.

The rapid acceleration of the universe’s expansion continues to challenge our understanding of fundamental physics. Why the ...

Nearly everything in the universe is made of mysterious dark matter and dark energy, yet we can’t see either of them directly ...

Studies suggest that the universe's expansion is decelerating — but what could that mean for the future of the cosmos?

Dark energy is one of the most mysterious features of our universe – we don’t know what it is, but it controls how the universe is expanding, as well as its ultimate fate. Now, a study of millions of ...

The Standard Model of our universe doesn’t match the evidence, in part because of dark energy, a ghostly force pushing the ...

For a generation, cosmologists have treated dark energy as a fixed backdrop, a steady pressure stretching space faster and ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

Dark energy, a mysterious force that scientists believe is behind the accelerated expansion of the universe, is weakening — which could result in the universe over the course of billions of years ...