#OTD in 2009, the final #Hubble servicing mission launched. SM4 had an ambitious list of tasks designed to bring Hubble to the apex of its scientific capabilities and ensure it would operate for many years to come. (1/3) 🧵
During SM4 astronauts conducted five spacewalks to install two new instruments, repair two other instruments, and replace key components like gyroscopes and batteries. They also prolonged its life by boosting Hubble to a higher orbit. (2/3)
SM4 left Hubble at the peak of its scientific capability, and prepared it for many years of further scientific discovery. Hubble is now expected to continue science operations well into the 2030s. Credit: NASA (3/3)
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