1. Science & Technology

2. Science & Technology
Science is concerned with gathering knowledge and organizing it.
Technology is applied science.
Provides the tools needed by scientist in their further explorations
Used for practical purposes by technologists and engineers
Technology is a double-edged sword. It can be helpful and harmful.

3. Hubble Space Telescope
Named after astronomer Edwin Hubble
Launched in 1990
Sensitivity to Light: Ultraviolet through infrared (115 nm to 2500 nm)
Size of a large school bus
Power source: Sun

4. Satellites
Satellite: is basically any object that revolves around a planet in a circular or elliptical path
Examples: GPS, Emergency radio beacon, cable tv
First satellite: Sputnik

5. Observatories
Observatory (in astronomy): a building or group of buildings from which the heavens are studied.
Observatories range in size from a single small building in an amateur astronomer's backyard to huge complexes where many professional astronomers work and live.
Two basic types of ground observatories.
Optic
radio

6. Optical observatories
Can study: visible light from stars, planets and other objects.
Location on the ground: clear, dry, calm and stable air and far from cities
Island mountaintops
Remote mountaintops
Equipment: telescope

7. Radio Observatories
Radio observatories study the heavens with radio waves, either emitted by the objects studied or transmitted from the earth and reflected from the moon or planets.
Larger than optical telescopes – necessary to focus the radio waves which are much longer than light waves.

8. Location: valleys surrounded by mountains.
Light, clouds and turbulences have virtually no effect on radio telescopes.
Radio signals from broadcasting stations and electrical machinery interfere with observations.
Mountains or hills surrounding the radio observatory block out stray radio signals

9. Telescopes Telescope focuses light and creates an image
Telescope focuses light and creates an image
The image is recorded
Old school – draw it
Later – photography
Today – CCD: charge-coupled devices