Hubble has marked so much the image we have from space that we cannot even imagine. And its adventure is great, being able to service a spacecraft made it so paradigmatic of the conquest of space by humankind.
A "not-so-fun" story that not everyone knows is that Hubble was sent to space but because of a design fault, the telescope was myopic. From 1990 to 1993 the images were somehow corrected via data processing and a corrective system was installed by a crew that reached the spacecraft on board of the space shuttle