Black Hole Explorer
Classes 6–12 · about 6 minutes · free, no sign-up
What you will learn
Understand a black hole as mass squeezed inside its Schwarzschild radius, see how gravity bends light, and why a black hole does not suck in things far away.
How to play
- Pick you, the Earth, the Sun or the black hole at our galaxy's centre, and see how small each would be as a black hole.
- Move a light ray closer to a black hole and watch it bend, circle and fall in.
- Find the closest distance light can pass and still escape.
- Then show many rays at once. The light paths come from Einstein's equations.
Go deeper
Notes, practice questions and tests for the same topic:
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