light

Universe. Waves moving aways from a source of bright light in centre.

Gravity could have transformed into light in the early Universe, new study suggests

Gravity could have transformed into light in the early Universe, new study suggests, but only if space-time behaves in just the right way.

Time lapse photography by Chuttersnap on Unsplash

Why does time change when traveling close to the speed of light? 

Why does time change when traveling close to the speed of light? A physicist answers.