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Tools of Astronomy
Electromagnetic Radiation
Light travels as an “Electromagnetic” Wave
The light you see is called Visible Light
Speed of light: 186,000 Miles/Second
Spectrum: the different colors and wavelengths
of light.
Electromagnetic Spectrum
(Energy Spectrum)
_____________ visible light_____________
Long waves
(infrared wavelengths)
Short waves
( Ultraviolet
• Splits light – into it’s “Colors”
• Identifies:
1. Elements that make up a Star
2. Star Temperature
Prism: triangular piece of glass that splits up
Types of Telescopes
• Optical: gathers visible light
• Radio: gathers invisible energy
• Optical: use lenses and mirrors
collects and focuses light.
• Refracting Telescopes: Use lenses
• Reflecting Telescopes: Use Mirrors
Curved Mirrors
Example: Hubble space telescope
The largest telescopes are Reflecting
Hans Lippershey
• Invented the Telescope
• First person to use a telescope to observe
objects in the night sky.
Radio Telescopes
• Gathers invisible radio energy
Collects and focuses energy