🌑 Black Hole

Drag the probe toward the event horizon. Watch its clock slow down.

Drag the yellow probe closer to the black hole
🛰️ Your clock
0.00 s
⏱️ Probe's clock
0.00 s
↔ Drag the probe
Event horizon
Accretion disk
Probe
Distant stars
⚫ Black hole mass 10 solar masses
More mass = bigger event horizon. The Sun would need to shrink to 3 km wide to become a black hole.
📍 Probe distance 3.0 rs
Distance is in Schwarzschild radii (event horizon = 1.0). Below 1.0 is inside the black hole.
Time slowdown
1.00×
Light redshift
none
Escape velocity
0% c
Schwarzschild radius
30 km

Why this is mind-bending

⏰At 1.5× event horizon, time runs at~58% of normal
🔴Light from probe shifts toward red becausephotons lose energy
🧊From outside, the probe never actuallycrosses the horizon
🌀Light from behind the black holebends around it
🎯M87* event horizon is38 billion km wide

Tour the concepts

The big idea

A black hole is a region where gravity is so strong that nothing — not even light — can escape once it crosses the event horizon. But the truly mind-bending part isn't what happens inside. It's what happens to time, light, and motion as you approach the horizon. Drag the probe closer and watch.