Why do optical astronomers often put their telescopes at the tops of mountains, whereas radio astronomers sometimes put their telescopes in deep valleys?

What will be an ideal response?


A mountaintop is better for optical telescopes in order to decrease atmospheric distortion. Radio signals are not significantly affected by atmospheric distortion but are affected by noise from various human-made sources.

Physics & Space Science

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A comet's nucleus is composed of:

A. dust, dry ice, and water ice. B. methane and hydrocarbons C. just iron D. gases, including mostly hydrogen and helium. E. iron and silicates.

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When a gas is changed to a liquid, the gas

A) releases energy. B) absorbs energy. C) both of these D) neither of these

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The vast majority of pulsars are known only from their pulses in

A) X-rays. B) gamma-rays. C) visible light. D) microwaves. E) radio waves.

Physics & Space Science

A pair of crossed Polaroids will transmit light

A) of sufficiently long wavelengths. B) that itself is polarized. C) if a third Polaroid at about 45 degrees is inserted between the two.

Physics & Space Science