Researchers have unveiled a new model for the universe’s birth that replaces cosmic inflation with gravitational waves as the ...

This mind-bending idea revolutionized physics and opened up new possibilities for understanding the universe. GPS navigation systems, for example, rely on Einstein's theories to account for the ...

For the first time, scientists have detected two black hole mergers with spins so unusual they may reveal a new generation of ...

Astrophysicists at the University of Chicago have developed physics-based models suggesting that dark energy could be changing over time. Dark energy, the mysterious force causing the universe to ...

Einstein was a great thinker who made plenty of mistakes—errors that sometimes led to more meaningful discoveries in physics, ...

Two recently observed black hole mergers, occurring just weeks apart in late 2024, have opened an extraordinary new window ...

It's a plot device beloved by science fiction: our entire universe might be a simulation running on some advanced ...

The universe rarely fails to amaze. One of its latest surprises—nicknamed the “Einstein zig-zag”—reveals a stunning arrangement of galaxies and a distant quasar. Together, they produce a gravitational ...

To understand gravity, Einstein had to rethink space and time as a single connected fabric. He showed that mass bends this fabric, guiding how everything moves. NOVA is available to stream on pbs.org ...

The faster you move, the stranger time becomes. By imagining how light travels to two people moving at different speeds, Einstein showed that time isn’t absolute. His thought experiment revealed that ...