“There’s a lot of meanings for ‘small,’” says Janet Conrad, a particle physicist at the Massachusetts Institute of Technology ...

Our universe is dominated by a mysterious matter known as dark matter. Its name comes from the fact that dark matter does not absorb, reflect or emit electromagnetic radiation, making it difficult to ...

WASHINGTON, June 16 (Reuters) - The universe has two kinds of matter. There is invisible dark matter, known only because of its gravitational effects on a grand scale. And there is ordinary matter ...

ESA’s orbiting X-ray observatory XMM-Newton has been used by a team of international astronomers to uncover part of the missing matter in the universe. 10 years ago, scientists predicted that about ...

For more than a century, physics has been built on two great theories. Einstein's general relativity explains gravity as the ...

How do you distinguish a galaxy from a mere cluster of stars? That's easy, right? A galaxy is a large collection of millions or billions of stars, while a star cluster only has a thousand or so. Well, ...

The regular matter that makes us, planets, stars, and galaxies is about 5 percent of the matter-energy content of the universe. The rest is made of dark matter and dark energy, though we are not sure ...

Theresa Fruth works for the University of Sydney. Most of the matter in the universe is missing. Scientists believe around 85% of the matter in the cosmos is made of invisible dark matter, which has ...

A supercomputer's simulation of the cosmic web filament, flowing with gas and feeding galaxy formation. Image: Davide Tornotti/University of Milano-Bicocca/MPA Researchers compiled hundreds of ...

At age 12, Tracy Slatyer felt sorry for a book. She read a newspaper article about how lots of people were buying A Brief History of Time by Stephen Hawking. “But then … nobody was actually reading it ...

With a temperature of over 10 million degrees, the filament contains approximately 10 times the mass of the Milky Way. Astronomers have discovered a massive hot gas filament that connects four galaxy ...