aviod the absorption of the light or other radiations in the atmosphere of earth
an opital telescope
Placing the telescopes in valleys is believed by some people to slightly reduce radio interference, but when radio telescopes are placed in valleys, it is usually because they are so large and the mountains work as supports, to reduce the cost.
because looking through the Earth's atmosphere can distort the incoming light.
Some frequencies of light are attenuated by water vapor.
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an opital telescope
If there is then we, being right beside a star, cannot know of it. We appear to be surrounded by stars and galaxies.
The earth's atmosphere doesn't let these rays reach the ground, so the telescopes are placed in orbit where they can receive the rays.
Satellites
Placing the telescopes in valleys is believed by some people to slightly reduce radio interference, but when radio telescopes are placed in valleys, it is usually because they are so large and the mountains work as supports, to reduce the cost.
Optical telescopes are placed high to avoid having to look through the thickest part of the atmosphere. Radio telescopes are place in valleys to avoid the effects of man-made electrical noise in the telescope.
The Earth's atmosphere provides interference to optical telescopes because the molecules in the air scatter and disrupt light. Many telescopes are placed at high elevation because the atmosphere is thinner and will cause less interference.
blocked by the Earths atmosphere but can be detected by telescopes placed in orbit round the Earth
because looking through the Earth's atmosphere can distort the incoming light.
Some frequencies of light are attenuated by water vapor.
Screed is primarily used to smooth concrete after it has been placed on a surface, it is a flat board. It is an essential factor in placing down flooring.
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