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Which types of telescope are obiting ...

Which types of telescope are obiting around the earth ? Why it is necessary to put them in space ?

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(i) The different types of telescope orbiting around the earth are optical telescope (Hubble), X ray telescope ( Chandra) etc.
(ii) These telescope are placed is space because .
(a) Some of the light coming form heavenly bodies is absored by earth' atmosphere.
(b) The position of image in disturbed due to changes in pressure and turbulence in atmosphere.
(c) Optical telescope cannot be used during the day due to sunlight.
(d) During night city lights and cloudy weather cause difficulty in obervations.
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