Physics

The director of “Particle Fever” talks about his film.

The unlikely heroes that made starlight possible.

The unlikely heroes that made starlight possible.

Lee Smolin argues that time is more fundamental than physical laws.

Sean Carroll and Alan Guth talk about time.

Past and future may not be what they seem.

How time travel might explain some of science’s biggest puzzles.

How time travel might explain some of science’s biggest puzzles.

If the constitution of nature itself were changing in time, how would you know?