New data from major dark-energy observatories suggest the universe may not expand forever after all. A Cornell physicist calculates that the cosmos is heading toward a dramatic reversal: after ...

Drawing together leading experts from across the field, an international collaboration of cosmologists has created a unified ...

“For the last 20 years, people believed that the cosmological constant is positive, and the universe will expand forever,” says Tye, a professor emeritus at Cornell. A positive constant acts like a ...

The universe may not fade into darkness. New calculations suggest it could collapse in a dramatic Big Crunch just 20 billion years from now.

For the last 25 years, most scientists have believed that about 70% of the universe is formed by something called ‘’dark ...

A physicist proposes that the universe is not empty space, but is a viscous fluid, fueling the expansion and contraction we see.

We've known that the universe is expanding since 1929, and that its expansion is accelerating since 1998. The culprit behind ...

It's well established that the universe is expanding, but there's serious disagreement among scientists over how fast it's happening.

"We are moving from post-diction to prediction," said Raghu Kulkarni. "These papers demonstrate that the confusing constants ...

A physicist proposes that the universe might not be empty but act like a viscous fluid, resisting expansion. This bold idea ...

They show up as a mathematical solution in general relativity, basically as a time-reversed version of a black hole. Some ...

All the “normal” matter, like the stars, gas, dust, and people, is called baryonic matter, and it’s basically the tiny visible fraction of a universe that’s mostly invisible and still not fully ...