The early modern physicist Isaac Newton had presumed an unperceived yet real flow of time. To Newton, time is a dynamic ...

Explaining how a fly inside a rocket traveling near the speed of light cannot break the light barrier due to relativity.

Recent advancements in observational techniques have led to the capture of high-resolution images of black hole shadows, ...

Interstellar comet 3I/ATLAS, which originated outside our solar system, has reportedly confirmed one of Albert Einstein's ...

Researchers are using black hole “shadow” images to test whether Einstein’s relativity remains unshakable. With next-generation telescopes, they hope to spot telltale signs of alternative physics ...

Centuries before anyone pointed a telescope at the sky, Isaac Newton figured out how gravity works. He showed that any object with mass pulls on every other object—a result that explained falling ...

Relativity Space, a launch startup developing a reusable rocket, has expanded a contract to provide launches for satellite ...