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Line 1: − The '''Advanced X-Ray Astrophysics Facility''' (AXAF) is one of [[NASA]]'s ''Great Observatories''. It is an X-Ray telescope designed to perform astronomy from low [[Earth]] orbit.+ − − == Sources == − − [http://wwwastro.msfc.nasa.gov/xray/axafps.html AXAF] − − [[category:astronomy]]
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