1. Starlight
the light we see
from space

2. Electromagnetic Spectrum
Starlight
Light - Electromagnetic Energy
Speed - 300,000 km/s – mps
Electromagnetic Spectrum
High Frequency (f) = Short Wavelength (λ)
Ex. Ultraviolet, x-rays, gamma rays
Low f = Long λ
Ex. Infrared, microwaves, radar, FM Radio, television
AM Radio, Shortwave Radio

3. EM Spectrum

4. Blue light = high f, short λ Red light = low f, long λ
Visible Light
Visible Light
the part of the electromagnetic spectrum that you can see
Blue light = high f, short λ
Red light = low f, long λ

5. A tool to learn about distant stars – the most important!
Spectroscope
A tool to learn about distant stars – the most important!
Gives info. about a star’s
Composition
Size
Luminosity/Abs. Magnitude
Motion

6. Spectroscope

7. Spectroscopy

8. How it works

9. Sun's Spectrum
Simple Version