Editing GALEX (section)

== Experiment ==
=== Ultraviolet telescope ===
GALEX carries a single f/6.0, Ritchey–Chrétien telescope, with a {{cvt|50|cm}} diameter primary, and a {{cvt|22|cm}} secondary mirror. Beam-splitters direct the Near UV (NUV) and Far UV (FUV) components to separate photoelectric detectors of diameter {{cvt|6.5|cm}}. In each, the photoelectrons are multiplied by a microchannel plate, and detected by the anode grid. The grid enables determination of the exact position of [[electron]] impact, by the time delay of each pulse at the two ends. The telescope has a [[field of view]] (FoV) of 1.2°, and a resolution of five [[Minute and second of arc|arcseconds]], and enables either imaging or spectral composition of a single star/galaxy, by a rotatable wheel containing a clear window and a [[grism]] (a cross between a grating and a prism).<ref name="Experiment1">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=2003-017A-01|title=Experiment: Ultraviolet Telescope|publisher=NASA|date=28 October 2021|access-date=3 December 2021}} {{PD-notice}}</ref>