For decades, physicists have faced one of science’s greatest puzzles: merging quantum mechanics, which describes tiny ...

Black hole and Big Bang singularities break our best theory of gravity. A trilogy of theorems hints that physicists must go ...

Instead of the big bang, some physicists have suggested that our universe may have come from a big bounce following another ...

The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same for all observers.

A collision observed between two black holes, each more massive than a hundred suns, is the largest merger of its kind ever ...

In 1919, a total solar eclipse allowed scientists to confirm Einstein’s theory of general relativity by observing how the sun’s gravity bent starlight. This discovery revolutionized physics and made ...

For reference, Pluto’s average distance from the Sun is about 40 AU, so 2023 KQ14 is quite distant. At 23.4 billion miles (37 ...