Ch. 28 Sec. 1

1
Ch. 28 Sec. 1

• Tools of Astronomy

2
Tools

• Radiation
• Light is the best tool used to observe and learn
  about the universe
• Before telescopes, scientist used light from
  stars
• Travel as waves
• Radio waves, Infrared, Visible light, UV rays
• Humans only see visible light
• Classified by frequencies
• As frequencies increase, the wavelength decreases

3
(No Transcript)
4
Tools

• Telescope
• First used by Galileo
• 4 Main Benefits
• 1) Different Attachments
• Observe all wavelengths that objects emit
• 2) Light to a Focus
• Takes distance light and brings it to one point
  for human eye to see

5
Telescope

• 3) Use of specialized equipment
• Photometer used to measure intensity
• Heat and strength of stars, Novas
• 4) Time Exposures
• Selected time intervals can gather photographs
  to faint to be seen from human eye

6
Telescope

• Refracting
• Used a lens to bring a light into focus
• Faint ring around image is distortion of light

7
Telescope

• Reflecting
• Bring light into focus using mirriors
• Most scientific telescopes are located high
  altitude for less atmosphere

8
Radio Telescope of different Wavelengths

• Bring in as much radiation into focus
• Dish that reflects all waves to a focus above the
  dish

9
Radio Telescope of different Wavelengths

• Interferometry
• Process of linking separate telescopes together

10
Others

• Space instruments are used because Earths
  atmosphere blocks many different rays
• Hubble Space Telescope
• Use til 2010
• Picks up sharp images

11
(No Transcript)