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

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

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

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

NEW YORK (AP) — Distant, ancient galaxies are giving scientists more hints that a mysterious force called dark energy may not be what they thought. Astronomers know that the universe is being pushed ...

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 ...

Scientists with the Dark Energy Spectroscopic Instrument (DESI), an international research collaboration, presented new evidence Wednesday that bolstered its recent finding that dark energy is not ...

This study could transform our understanding of the future of the universe and raise the possibility that the universe may ...

Contrary to popular belief, our universe may not be constantly expanding after all. A groundbreaking study by South Korean ...

A new study questions dark energy's role in the universe's acceleration, suggesting it may be weakening instead.

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