2. TELESCOPES: THE TOOLS OF ASTRONOMY

ONLINE EXPLORATION:

1. List three advantages of reflecting telescopes over refracting telescopes.

2. What and where are the largest optical telescopes in use today?

3. Discuss the advantages and disadvantages of radio astronomy compared to
   optical observations.

4. Why do radio telescopes have to be very large?

6. What kind of astronomical objects can we best study with radio techniques?

7. Explain how interferometry can enhance the usefulness of astronomical
   observations.

8.List the other types of non-visible radiation (infrared, ultraviolet, microwaves,
   x-rays and gamma-rays) currently being exploited for astronomical observation
   and summarize:
- Names of astronomical tools
-  Advantages and limitations, and
- Chief uses of each.

LINKS:

Refractor Telescopes
Characteristics, advantages and disadvantages of refractor telescopes.

Reflector Telescopes
Characteristics, advantages and disadvantages of reflector telescopes.

Optical Telescopes
The world's largest Optical telescopes

Radio Telescopes
Characteristics of radio telescopes.

Telescopes
This website describes the main features of optical-band telescopes.

Differences between Optical Telescopes and Radio Telescopes
Radio astronomy tutorial.

Why Send Telescopes into Space?
Resources on multi-wavelength astronomy

Main Electromagnetic Spectrum Telescopes and Observatories:
Hubble Space Telescope
National Radio Astronomy Observatory
Laser Interferometer Space Antenna (LISA)
Extreme Ultraviolet Explorer
Infrared Astronomy
X-Ray Astronomy
Gamma-Ray Astronomy