dark energy

The universe is expanding 9 percent more quickly than expected, telling us there's something we're missing. Could it be a new type of particle?

For thousands of years, we have thought we knew what the universe – and everything in it – ...

Only about 5% of the universe consists of ordinary matter such as protons and electrons, with the rest ...

Dark matter is the most common stuff in the universe. Now, studies are beginning to shed some light ...

Space may seem calm, but it is a more hostile environment than that on Earth. Invisible radiation is ...

Did dark matter kill the dinosaurs? Recent work by Harvard physicists may have us reevaluating the mysterious substance ...

Model of the Big Bang theory. (NASA) British astronomer Sir Fred Hoyle was skeptical of the idea that our ...

The conventional understanding of gravity just doesn't seem to fit with what we're learning about the cosmos and ...