Something seems to be missing from the universe, and the favored model of physics calls it “dark matter” – but despite a century of searching, it remains a no-show. A new paper proposes an alternative ...

An astrophysicist has shown that gravity may be able to exist without mass, a theory that suggests dark matter may not be necessary to explain phenomena observed in our universe. Dark matter is a ...

Some clusters of galaxies may not need dark matter in order for their physics to work. In new research, a physicist describes a “shell singularity,” where gravity applies without mass. Today’s ...

Massive objects warp the space-time around them. The greater the mass, the greater the warping of space-time. Light bends near massive objects because it follows curved space-time. Gravity doesn't ...

Mass is mass is mass. Physicists have three different definitions of mass, all thought to be equivalent. Measurements of the distance between Earth and the moon confirm that two of those masses are ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. Matter tells space how to curve, and curved space tells matter how to ...

Researchers have found that bone and muscle mass are regulated by the altered gravity. The experiments were done in space using Kibo, an ISS module developed by JAXA, and on the ground. An ...

Living on the International Space Station (ISS) may seem like a glamorous adventure for most of us here on Earth. However, astronauts need to be constantly monitored in space, and understanding the ...