From a particle smasher encircling the moon to an “impossible” laser, five scientists reveal the experiments they would run ...

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

For more than a century, gravity has been the stubborn outlier in physics, perfectly described on cosmic scales yet refusing to mesh with the quantum rules that govern everything else. A growing camp ...

Quantum theory and general relativity have long described the universe with incompatible languages, one speaking in ...