Fun fact: A hobby satellite my father helped build as a way to justify procrastinating during university in the late 60s is now low Earth orbit space junk. He says he's rather embarrassed to have learned, post launch, that it would likely remain in orbit for 100,000 years.
https://en.wikipedia.org/wiki/Australis-OSCAR_5
http://centralblue.williamsfoundation.org.au/oscar-5-the-fir...
https://www.youtube.com/watch?v=hjhto6wUQYQ