1. Tools of Astronomy

2. Radiation and the Electromagnetic Spectrum
Electromagnetic Radiation (ER) is a form of energy that is emitted and absorbed by charged particles and exhibit wave-like behaviour
All energies in the Universe may be described on the electromagnetic spectrum.
ER possesses electric and magnetic field components
All ER travel at the speed of light (c = 3.00 x 108 m/s)

3. Light behaves like a wave
Light behaves like a particle

4. Electrometric Spectrum

5. Using and Calculating Wavelength
ER is classified by their wavelength (distance between wave crests) and is described by lambda (λ)

6. Using and Calculating Wavelength
ER is also classified by their frequency (number of waves that pass a given point per second) and is measured in Hertz (Hz; cycles per second)

7. Relating Speed, Frequency and Wavelength
c = f λ
c = Speed of light = 3.00 x 108 m/s
f= frequency = measured in cycles per second; Hertz (Hz)
λ = wavelength = measured in meters

9. Telescopes “Tele” - far “Scope” – to look
An instrument that is used to observed remote objects by collecting ER.

10. 1. Refracting Telescope Refraction refers to the bending of light
Gather and focus light on a focal point (focus)

11. 2. Reflecting Telescope Reflecting refers to bouncing rays of light
Designed to allow for very large diameter objectives

12. Interferometry and the Effect of Technology
A family of techniques / instruments / surveyed information that may be combined and superimposed to uncover relationships between different types of ER

19. Hubble Space Telescope
Was launched in 1990
Named after Edwin Hubble (astronomer responsible for confirming the existence of galaxies outside of the Milky Way)
2.4-meter aperture telescope
Able to detect near UV light, visible spectrum, and near IR

21. Hubble Space Telescope
Within weeks of launch, images observed back on Earth were of poor quality
The primary mirror had been incorrectly mounted
The problem was corrected in 1993 with the addition of another mirror

26. Chandra X-ray Observatory
Launched July, 1999
Named after Subrahmanyan Chandrasekhar (astrophysicist; Nobel Prize winner for describing processes significant to the structure and evolution of stars)
Able to detect X-ray radiation

29. Try This
Finish frequency/wavelength worksheet
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