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

The model questions the popular inflation theory, which most experts believe was facilitated after the universe's birth. The ...

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

The story begins with the black hole information paradox. According to relativity, anything that falls into a black hole is ...

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 ...

The gravitational lensing that causes this rare phenomenon cannot be explained solely by looking at observable ...

Few of Albert Einstein’s sayings have been as widely quoted as his remark that God does not play dice with the universe. People have naturally taken his quip as proof that he was dogmatically opposed ...

Astronomers have made a groundbreaking discovery of a ‘dark object’ concealed within a warped ‘Einstein ring’ located 10 ...

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 ...

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 ...