Star, light and distance. Explain EMR and the properties of light. Understand the use of spectroscopes. KEY WORDS Luminosity Spectroscope Electromagnetic spectrum. Stars - classified by age, distance, and brightness Brightness ( luminosity ) of Stars
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Star B looks brighter - apparent
Star B is closer to us than Star A.
- same Absolute magnitude.
The Sun is bigger than about 95% of stars.
Low energy High energy
Red light is low energy – cool
Blue is high energy - hot
Each gas in the star absorbs unique parts of the light energy as it is released.
The black lines in the spectrum show the elements that make up the gas surrounding the star.
Light from the sun through a spectroscope
Absorption lines of Helium