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 ...

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

Researchers may have found our galaxy's missing companions, further bolstering science's most widely accepted cosmological ...

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

Webb’s new images of the Bullet Cluster reveal the most detailed dark matter map yet, shedding light on cosmic collisions and ...

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

But axions were pushed aside as the WIMPs hypothesis gained more steam. Back-of-the-envelope calculations showed that the ...

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 ...