How is matter different from mass? These and other questions about the deepest levels of physics, answered inside.

For nearly a century, scientists around the world have been searching for dark matter—an invisible substance believed to make ...

Researchers using data from NASA's Fermi Gamma-ray Space Telescope have set the most stringent limit yet for the mass of dark matter. The new findings throw into question recent findings from ...

It’s not an easy thing to do. For one, it’s difficult to measure the mass of something we’re inside of. The Milky Way galaxy measures some 258,000 light-years across. (Recall that one light ...

The invisible dark matter is one of the universe's biggest mysteries, and its existence is confirmed only by the ...

Around 68 percent of the remaining mass is dark energy, with just five percent left to ordinary “baryonic” matter, which are the objects we can directly observe.

Learn about dark matter and dark energy. A simulation of the dark matter distribution in the universe 13.6 billion years ago. Illustration courtesy Volker Springel, Max Planck Institute for ...

How fundamental particles of matter acquire mass is still a puzzle to scientists. In science, there are thousands of ways to measure the world around us that the average person may never encounter.

Albert Einstein’s famous formula established the interchangeability of mass (matter) and energy in 1905. In 1945, this equivalency was demonstrated to all with the detonation of the first atomic ...