Sandbox Physics

Physics,in motion.

Change a parameter. Watch what happens.

Explore the labs

A nonspinning black hole model with bent light, gravitational redshift and Doppler beaming.

Open black-hole Lab

2026 Nobel Prize in Physics

An invisible particle. A new view of the universe.

Meet Francis Halzen, IceCube and the worldwide effort to understand neutrinos. Read the stories, then try the experiments.

Explore the Nobel feature

Just addedNov 13, 2026

Relativistic Jets and Apparent Superluminal Motion

How can a jet knot appear to move faster than light?

Where to begin?

All experiments 732

Mechanics

\frac{d\mathbf p}{dt}=\mathbf F

180 experiments

Waves & light

\frac{\partial^2\psi}{\partial t^2}=c^2\nabla^2\psi

187 experiments

Fields & matter

\mathbf F=-\nabla U

183 experiments

Quantum

i\hbar\frac{\partial\psi}{\partial t}=\hat H\psi

182 experiments