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FUSE is the Far Ultraviolet Spectroscopic Explorer.

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It is a telescope that is in orbit, and it's designed specifically to do spectroscopy at very short far-ultraviolet wavelengths.

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It is a unique facility because it can look at wavelengths way beyond what can be done with the Hubble Telescope.

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It is a very specialized area of the spectrum, but it is also the richest part of the spectrum.

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In this part, from 900 to 1200 angstrom wavelengths, you see the lines from the hottest and most common elements that we know about – particularly the line series of hydrogen – and there are literally hundreds of lines from the interstellar medium.

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So, it is a very powerful region of the spectrum and this is a telescope that enables us to study it in all its richness.