Download Telescopes - ESS I. Uses for telescopes-

Telescopes - ESS
I.
II.
Detect waves
other than
light
III.
IV.
Uses for telescopesa. Collect far more light than the unaided eye
b. Magnify images, enabling astronomers to see detail and to visually separate distant objects.
Types of Telescopes
a. Optical Telescopes
i. Use lenses or mirrors to gather and focus star light
ii. Refracting Telescopes- bend light using curved lenses
iii. Reflecting Telescopes- use mirrors
1. Cheaper
2. More common
iv. Usually in buildings with domed roofs.
v. Many modern telescopes use a combination of technologies
1. Most famous is the Hubble space Telescope which is a Schmidt telescope
b. Radio Telescopes (26m)
i. Look like large satellites used for T.V.
c. Infrared Telescopes (smaller than red)
i. 1983
ii. Detected 10,000 unknown galaxies
d. Microwave Telescopes
i. 1989
e. Gamma Ray Telescopes
i. Detects the smallest waves
Electromagnetic Spectrum- know the order from long to short wavelength
a. Radioi. Longest wavelength
b. Microwavei. used by cell phones
c. Radari. good for tracking objects (speed, weather…)
d. Infraredi. Heat
ii. Military use
iii. Snakes use to find prey
e. Visiblei. order of colors in the rainbow – ROYGBV
ii. Red Shift- red has the longest wavelength, objects moving away from us
iii. Blue Shift- Blue has a shorter wavelength, objects moving towards us
f. Ultravioleti. “beyond purple”
ii. Sunburn
iii. cause cancer
g. X-Ray-see bones, produced by the sun, calcium absorbs x-ray radiation
h. Gamma Rayi. Shortest wavelength
ii. fastest frequency
iii. deadly, destroy cells
Spectroscopesa. Separate light into its colors
b. Combination of a prism and a small telescope
c. Use them to determine what elements stars are made