ASTR-1010 Lecture Notes - Lecture 10: Light Pollution, Gie
19 Feb 2017
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Document Summary
The wavelengths of radio waves are long. So the dishes which reflect them must be very large to achieve any reasonable angular resolution: the largest telescopes are designed to have, large collecting area and high angular resolution - the magnification is of secondary importance. Bad weather makes it impossible to observe the night sky. This is (cid:449)hy the sta(cid:396)s appea(cid:396) to (cid:858)t(cid:449)i(cid:374)kle(cid:859) Man-made light is reflected by the atmosphere, thus making the night sky brighter: light pollution. Ea(cid:396)th(cid:859)s atmosphere absorbs most types of light: good thing it does, or we would be dead. Only visible, radio, and certain ir and uv light make it to the ground. Two (or more) radio dishes observe the same object. Has the angular resolution one would get from a dish the size of the distance between them. 2 essential features of telescope: angular resolution, light collecting area, both depend on diameter of main area of telescope.
