Space & gravity
Event Horizon · Relativistic observatory
Black holes
Follow light around a black hole: lensing, orbiting matter, and the slow pace of time near the horizon.
- Gravitational lensing
- 10 scenes
- Guided tours
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A little closer to the universe.
Approximate sky over Ondřejov
Orbits & time
Orrery · The solar system in motion
Solar system
How the solar system moves and how it was born: the planets where they are today, and how the young giants reshaped the paths of the small bodies, out to the Oort cloud.
- Live planet positions
- 10-billion-year timeline
- Out to the Oort cloud
Distance & light
Deep Field · As far as we can see
Deep Field
One zoom from the Sun past the nearest stars and galaxies to the oldest light we can see. The farther you look, the older the light.
- Out to 46 billion light-years
- Distance as lookback time
- The edge of the observable universe
Light & atoms
Stellar Spectra · Fingerprints in starlight
Stellar Spectra
Split starlight into its colours and read the dark lines: which atoms, how hot, how fast.
- Elements by their lines
- Kirchhoff's bench
- The spectral sequence