It wasn't contamination related, but something similar happened to Hubble in the 1990s. https://www.nasa.gov/mission_pages/hubble/servicing/index.html https://

It wasn't contamination related, but something similar happened to Hubble in the 1990s. https://www.nasa.gov/mission_pages/hubble/servicing/index.html https://www.nasa.gov/mission_pages/hubble/servicing/index.ht...