Read the light
A spectrum separates light by wavelength, revealing information hidden inside a single bright point.
In 30 seconds
- Atoms and molecules interact with particular wavelengths.
- Patterns can help infer composition and physical conditions.
- Interpreting a spectrum requires models, calibration and uncertainty estimates.
Make it concrete
A rainbow tells you light contains many wavelengths. A scientific spectrum additionally measures how much light is present at each wavelength.
- 01Incoming light
- 02Split by wavelength
- 03Interpret
Check your understanding
Can light carry information about a distant object’s composition?
- Atoms and molecules interact with particular wavelengths.
- Patterns can help infer composition and physical conditions.
- Interpreting a spectrum requires models, calibration and uncertainty estimates.
Go to the source
Sources reviewed: 13.09.2026