Tag: physically

Ask Ethan: Are singularities physically real?

One of the most important advances in all of physics was the development of Einstein’s General Relativity: our greatest and most predictively powerful theory of gravity. Replacing the idea of a “gravitational force” that acts on objects that never physically touch one another with ...

Where Does Energy Come from and Go to? — Time, Physically!

“Nothing can be accelerated to the speed of light c” because it will require infinite energy to do so, even for a particle, even more so for a car, why? According to the mv²/2 formula, the energy required for getting to c-speed is finite mc²/2. However,...