Now astronaut Chris Hadfield has sent down his last space tutorial from the International Space Station and this time it's a little sing song!
The Canadian's heading back to Earth on Monday after his five month mission but couldn't resist recording his own version of a David Bowie tune.
His videos, which he uploads online, have built up a big following down on Earth.
Newsround will definitely miss his updates!
Footage courtesy of Chris Hadfield, NASA and CSA