![Two astronauts replacing hardware on the telescope.](https://science.nasa.gov/wp-content/uploads/2023/07/27946755571-cc78c78762-o.jpg?w=4096&format=jpeg)
Astronauts C. Michael Foale and Claude Nicollier
C. Michael Foale (left) and Claude Nicollier participate in the second of three STS-103 spacewalks to service the Hubble Space Telescope (HST). On this outing they replaced a Fine Guidance Sensor (FGS). Nicollier, a European Space Agency (ESA) astronaut, stood on the end of the Remote Manipulator System (RMS) robotic arm.
Credits: NASA
Image CreditNASA
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