New measurements using gravitational lensing suggest the universe’s current expansion rate does not agree with signals from the early cosmos.

For over two decades, cosmologists have believed that the universe is expanding at an accelerating pace, driven by a ...

Astronomers are a step closer to cracking one of the secrets of dark energy—the mysterious force believed to be causing the universe's accelerated expansion.

Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand ...

Medney (" Beyond Kuiper ") and co-author Don Macnab-Stark have crafted an intelligent examination of the human condition in the 23rd century as it surges into an existential era of decision, and we’ve ...

With major eclipses, brilliant supermoons, and lineups of five or more planets, 2026 offers something awe-inspiring in every season. Here’s what to watch for.