Matter is defined as that which 1) has mass and 2) has volume or takes up space. Mass is an intrinsic property whose base SI unit is the kilogram (kg).

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

How do you weigh one of the largest objects in the entire universe? Very carefully, according to new research.

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

Dark matter is one of nature's most confounding mysteries. It keeps particle physicists up at night and cosmologists glued to ...

But since dark matter has mass, its presence is inferred based on the gravitational pull it exerts on regular matter. But it's more complicated than that. In the 1920s, ...

If dark matter exists in the universe, scientists now have set the strongest limit to date on its mass. In a paper to be published on Dec. 1 in Physical Review Letters, Brown University assistant ...

NASA's James Webb Space Telescope (JWST) has produced a new image of the Bullet Cluster, which is a titanic collision between ...

If each photon had just a tiny bit of mass, it could upend the theory of dark matter. Mass Effect. For many years, astrophysicists have theorized that an invisible material they call "dark matter ...

According to the team’s results, dark matter should mass somewhere between 55 grams (1.9 oz), which is as much as a tennis ball, and 10 24 grams, which is around the mass of the dwarf planet Ceres.

For ordinary matter, momentum is given by the formula P = mv, where P is momentum, m is mass, and v is velocity. Even tiny amounts of matter can have vast amounts of momentum if the matter is ...

But since dark matter has mass, its presence is inferred based on the gravitational pull it exerts on regular matter. But it's more complicated than that. In the 1920s, ...