Physicists working at the CERN particle physics lab said they detected a slight but significant difference in how particles ...

No matter what you do, matter can neither be created nor destroyed. This property of the universe is called the law of conservation of mass.

Sound waves are fluctuations of density within materials. In classical physics, their energy can make matter move back and forth, but they were not thought to possess mass.

Mapping the dark matter. All galaxies are made up of stars, gas, dust, and dark matter, which are bound together by gravity. The Bullet Cluster is made up of two very massive collections of ...

Scientists estimate that 85% of the universe's total mass is dark matter. But the study authors write that their theory is distinct because it can be tested using existing observational data.

With 10 times the mass of the Milky Way, this filamentary structure accounts for much of the universe's "missing matter," the search for which has baffled scientists for decades.

NASA's James Webb Space Telescope recently zeroed in on the Bullet Cluster—delivering highly detailed images that show a greater abundance of extremely faint and distant galaxies than ever before.