A telescope is a device used to concentrate EM radiation, in order to observe a remote object. This concentration increases the apparent __________ and __________ of the object. There are three main types of ground based telescope:
The size of the 'collector' is determined by the __________ of the radiation and the __________ of the signal.
Telescopes can also be placed in __________ around the __________ as __________. These can provide better results as they do not suffer from absorption (most infra red frequencies do not reach the Earth's surface) and disruption by the __________. They are also more sensitive to weaker signals because they are colder and in darker surroundings. The big disadvantage is the __________.
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