Other Types of Telescopes

These flashcards cover the key concepts and definitions related to the various types of telescopes discussed in the lecture notes.

What are the different types of telescopes that use wavelengths other than visible light?

Infrared, Radio, Ultra-violet, X-ray, and Gamma-ray telescopes.

Why are infrared telescopes typically located on high mountains?

Because infrared light is partly blocked by the atmosphere, especially water vapor.

What is a unique challenge faced by infrared telescopes?

Earth emits infrared radiation, making it difficult to observe faint astronomical objects without interference.

What technique is used to improve resolution in radio telescopes?

Interferometry combines signals from multiple radio telescopes to enhance resolution.

What type of mirrors are used in ultra-violet, X-ray, and gamma-ray telescopes?

Grazing incidence mirrors, as normal mirrors would not reflect these wavelengths.

What is a characteristic of radio waves that allows radio telescopes to operate effectively?

Radio waves can pass through the atmosphere unimpeded.

What was significant about the Spitzer infrared telescope?

It was launched to observe in the infrared spectrum and was retired in January 2020.

What is a key feature of the James Webb Space Telescope?

It is an infrared telescope that was launched in December 2021.

What are two concerns associated with building telescopes?

Light pollution and radio interference.

What is the purpose of the International Dark Sky Association?

To promote more sensible lighting systems to reduce light pollution for astronomical research.