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The problem with Herschel's rather short mission is that they only had time to point it at the things they already knew they were interested in, e.g. the distribution of dust in galaxies, and the inner structure of the regions where stars form.
So they never got a chance to point it at things that might lead to major and unforeseen discoveries.
Not a good idea to throw away billions of dollars worth of telescope that is working in an unexplored wavelength regime.
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