![A mock-up of the Hubble Space Telescope in an enormous tank of water. An astronaut, standing on a replica of the Space Shuttle's robotic Canadarm is practicing the installation of Hubble's Science Instrument Command and Data Handling Module. On the far left, a scuba diver works on another component.](https://science.nasa.gov/wp-content/uploads/2023/11/hubble-327164main-sicdh-fs-img2-lg.jpg?w=4096&format=jpeg)
Hubble’s Science Instrument Command and Data Handling Module
An astronaut is training on how to install Hubble's Science Instrument Command and Data Handling Module prior to Servicing Mission 4.
Credits: NASA
Image CreditNASA
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An astronaut is training on how to install Hubble's Science Instrument Command and Data Handling Module prior to Servicing Mission 4.