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

Why the universe is expanding faster and faster remains one of the biggest open questions in physics. Current theories cannot ...

The X-Ray Imaging and Spectroscopy Mission (XRISM), a joint mission between the Japanese Aerospace Exploration Agency (JAXA) ...

A newly discovered celestial object may be a starless cloud that could change how astronomers understand dark matter.

Monuments are being built over centuries, manuscripts locked away for future generations. See how dramatic ongoing projects explore our bond with time.

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