FGS meaning in Space Science ?

Answer: What is Fine Guidance Sensor mean?

A fine guidance sensor (FGS) is an instrument on board a space telescope that provides high-precision pointing information as input to the telescope's attitude control systems. Interferometric FGSs have been deployed on the Hubble Space Telescope; a different technical approach is planned for the James Webb Space Telescope's FGSs.In some specialized cases, such as astrometry, FGSs can also be used as scientific instruments.

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