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 ...

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

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

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

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

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

Distant, ancient galaxies are giving scientists more hints that a mysterious force called dark energy may not be what they thought.See an excerpt of an interview in the video aboveAstronomers know ...

For a quarter century, cosmology has rested on a simple but audacious idea: that a fixed “cosmological constant” drives the ...