Such a tiny fraction of items on earth get to leave it. So it's refreshing that the ones who do, have a spectacular and well thought through ending.
Few products, services or digital services have there end designed, let alone in the detail that is required for any space program.
These versions of endings from @duncangeere at How We Get To Next are good inspiration for us all to think more about long term design or how to design endings.
1. Leave It There
2. Shoot It Down
3. Into the Unknown
4. Crash Landing