Many famous cosmonauts and astronauts take part in them, including those who are officially already dead.
The stark evidence is a display of photographs the astronauts took from space 20 years ago and recently.
What if an astronaut took his/her pet bird into space?
The astronaut takes a look around and comes back to Earth the same way.
Like previous missions, the astronauts took many photos of Earth from the station, over 700 in total, which have been made freely available.
The operation is not expected to require the astronauts to take a space walk outside the cabin.
Although computers handle most of an American shuttle's operations, astronauts take control in the final approach to landing.
The astronauts take samples from the ship before leaving.
The bar is designed so that the astronaut can take a bite and pull the remainder up.
Going to the bathroom becomes even more challenging when astronauts take a walk outside their spacecraft.