Could a reactionless, gravity-defying propulsion system actually work? A former NASA engineer says yes, but scientists are ...

This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

We still don't have an answer, but a new supercomputer simulation is the best guess ... of massive dead stars collapsing ...

But gravity only becomes noticeable when you have at least one very big mass (a planet for example). No, the distance is squared in the equation so it would have nine times the force (a third of ...

Developed in 1915, general relativity suggests that gravity arises because bodies with mass cause the fabric of spacetime (the four-dimensional unification of space and time) to warp. The greater ...

So, a 5 kg mass on Earth has a 5 kg mass on the Moon because the amount of matter stays the same. Weight is the force of gravity acting on an object. Weight is a force and so it is measured in ...

Although we take a lot of scientific knowledge for granted today, each of the basics – whether it be about light, gravity, mass or the shape of the Earth – had to be theorized and ...

Quantum gravity is the missing link between general ... a neutrino does not have a definite mass but exists as a quantum superposition of three different mass states. Coherence keeps this ...

Perhaps one of the most surprising discoveries of the 20th century was that this ordinary, or baryonic, matter makes up less than 5 percent of the mass of ... that repels gravity known as dark ...