this title is kind of weak, I know that, but I did not want to write “rusty, old piece of metal”. First because rusty could be a little bit misleading, rust only occurs when there is oxygen and there is only little of that in space, more accurately there is 1% of all the atoms in the Universe which is quite few tons but at the same time Hubble Space Telescope is flying in near vacuum when there are just a couple of hydrogen atoms per cubic meter, maybe in his lifespan he even touched few oxygen atoms. Second because he just does not deserve it. (Check out the post about James Webb Space Telescope)
His lifespan? Well it has been a long for such an instrument which are usually meant to work for much less years. For now the telescope has been working for 25 years, 9 months and 29 days. It is assumed that it might work for another 20 years or so, it could be even longer but it is slowing down and as I explained in post about orbits, it will eventually fall down and burn up in atmosphere. Not that this space telescope would be half immortal or so, but it was able to work for so many years because there were actually missions to repair some of its tools and power systems, otherwise it would not work by now .
When Hubble was launched and first images sent to NASA they were good, but not good enough which was because of the mirror. It was polished to a little bit wrong shape so they had to repair that. Before they did it NASA used some complicated image processing to get the best out of those pictures.
The repair itself was very complicated since replacing mirror was simply impossible and to bring the telescope back was too expensive. They solved it by making the same mistake but “of opposite direction” on another part of the telescope so it was totally canceled out, you can check out on the next picture to see how much it made a difference:
NASA even decided to borrow some of Hubble’s time for amateur astronomers, of course it was not easy to get that time but it was definitely worth it I am sure.
Hubble is not justing taking those beautiful pictures but it also helped to measure Hubbles constant on whole next level and also through his data we found out that the expansion of Universe is actually increasing, phenomenon which is not well understood but most people think that it is because of dark energy.
Hubble also helped with some observations of black holes and also as you can see above, Hubble made a whole new picture of the youngest parts of Universe, so extremely far away.Dragallur
Actually it is the first such thing in space that was repaired by humans which is actually pretty cool.
Check out this post to read about red shift, the x axis on the picture.