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Why do some space telescopes have to be cooled?

It is cold in space, unimaginably cold for us. The temperature that prevails there and the temperature of the cosmic background radiation (see the astronomy question from week 10: Where is the coldest point in the Universe?) is around minus 270 degrees Celsius. This is only slightly above absolute zero, which is minus 273 degrees Celsius, the lowest possible temperature. In spite of this, some space telescopes have to be cooled - but not others. But why?

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