When two black holes merge or two neutron stars collide, gravitational waves can be generated. They spread at the speed of ...

A group of researchers have made a shocking discovery about one of the most fundamental forces in our universe. According to a new paper, which is set to publish in Physics of the Dark Universe next ...

Why is light affected by gravity if photons are massless? originally appeared on Quora: the place to gain and share knowledge, empowering people to learn from others and better understand the world.

It is usually impossible to create something out of nothing, so for example a photon, a particle with no mass, cannot change into another particle with mass. However, in the early and very extreme ...

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The speed of gravity is the same as that of light, say two physicists. Knowing the speed of gravity is important for theories that attempt to unify the two pillars of physics: general relativity and ...

The creators of a light powered purely by gravity hope it will provide an alternative to toxic kerosene in the developing world. Almost a fifth of the world's population has no access to electricity ...

DeciWatt.org just raised $308,000 on IndieGoGo with its unbelievably resourceful Gravity Light invention. There are 14 days left in the crowdfunding campaign. The goal of this new product is to ...

A gravity powered LED light has been introduced by the designers of GravityLight. This light produces its own energy by, you guessed it, gravity. A string on one side of the light is pulled, lifting a ...