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Film summary
Discover how different wavelengths allow scientists to measure the distance to the stars.Key facts
- Light waves vary in length and in colour.
- The shortes visible light wavelength is violet, and the longest is red.
- Redshift occurs when light from distant galaxies travels through expanding space.
- As stars move away from the Earth, the light waves are stretched and appear redder, allowing astronomers to calculate the distance.
Transcript
Light comes in different wavelengths
We see different wavelengths as different colours
The shortest visible wavelength is violet
The longest visible wavelength is red
Redshift is when light from distant galaxies or stars appears redder
As light travels through expanding space it gets stretched or...
As galaxies or stars move away …
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