nt Object Spectrograph (FOS) and the Goddard High Resolution Spectrograph (HRS). By dividing light in this manner, the FOS and HRS enabled celestial objects to be studied in terms of chemical composition, temperature, velocity, and magnetic field. According to scientists, a sun-like star known as HD 209458 helped Hubble detect a new planet because of onboard spectrographÆs capabilities, ôEach time the planet passed in front of the star, the telescopeÆs spectrograph detected sodium in excess of what the star alone contained,ö (Spotts 2002, 3).
HubbleÆs three Fine Guidance Sensors are used to position the telescope by scientists who use gyroscopes to keep the telescope pointed at its target. The Fine Guidance Sensors also provide measurements and positions of celestial bodies. Two of the Fine Guidance Sensors are used to steer and hold the telescope on its target, while the ot
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