Extras

Video thumbnail: NOVA Einstein’s Thought Experiment

NOVA

Einstein’s Thought Experiment

Your perception of time depends on how you are moving.

Einstein’s Thought Experiment

Video thumbnail: NOVA What is Spacetime?

NOVA

What is Spacetime?

A mysterious concept changed the way we understand reality.

What is Spacetime?

Video thumbnail: NOVA Gravity's Effect on Spacetime

NOVA

Gravity's Effect on Spacetime

Einstein's theory showed that time itself is affected by gravity.

Gravity's Effect on Spacetime