If there is an absolute law in the universe, it’s that nothing can travel faster than the speed of light. Space is big, and ...

To answer Robertson: The Higgs field doesn’t appear to have more valleys to explore, according to our current understanding.

The Universe is immense. Our most powerful telescopes observe galaxies whose light has taken more than 10 billion years to ...

However we do not have to worry about the universe-obliterating Big Rip yet because if it happens it would happen in about 22 billion years.

Some things we see in space appear to outpace light. Now we are learning to harness these bizarre optical illusions to ...

What is the biggest object in the universe? Learn more about the biggest objects in the universe, including galaxies, galaxy clusters, and dark matter.

A more precise distance to the Coma galaxy cluster was measured. This measurement increases the discrepancy between observed and predicted universe expansion rates. The discrepancy, called the Hubble ...

We’ve grown up with the idea that the universe will expand forever, meaning the "cosmological constant" is positive. What if it's negative?

From early experiments with lanterns to Einstein’s revelations about space and time, the speed of light has proven to be far more than a number: it’s the cosmic constant that defines reality.

That would relieve astronomers, and everybody else, of an existential nightmare regarding the future of the universe. If dark energy remains constant, everything outside our galaxy eventually will be ...

The story begins with the black hole information paradox. According to relativity, anything that falls into a black hole is ...

An international group of more than 900 researchers studying the expansion of the universe presented their findings on Wednesday during the American Physical Society’s Global Physics Summit in Anaheim ...