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Most astronomical observatories are situated in Chile, Hawaii, Australia and the Canary Islands.
This is because they have:
1) High Elevation
2) Frequent cloudless nights
3) Low Atmospheric Pollution and dry air
4) Distance from built up areas
Advantages of computer controlled telescopes:
1) ability to work remotely
2) Continuous tracking of objects
3) More precise positioning
4) Computer recording and processing of data
Advantages of telescopes outside of the atmosphere:
1) Avoids absorption and refraction of the atmosphere
2) Can use parts of the e.m spectrum that the earth absorbs
3) Cost of setting up, maintaining and repairing
4) Uncertainties of space programme
International collaboration is good for the economy and pooling of expertise.
Other factors are important in planing which are: cost, environmental and social impacts and working conditions.
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