When you are on earth the gravity is holding down or putting pressure on your vertebrae and then when you are in space i isn't putting any pressure on your vertebrae, so it stretches out an inch or two.
Astronauts may appear taller in space due to spinal elongation caused by the lack of gravity compressing the spine, allowing the vertebrae to separate slightly. This effect is temporary, and astronauts typically return to their original height once back on Earth and gravity begins compressing their spine again.
they take there rocket back
they used a module that carried them back
Atlantis was the last space craft that carried astronauts to Space station and back to earth.
Yes, Possible Maybe
It's the same reason you can only see one side of your head when you look in a mirror. The astronauts would need a mirror to see round the back.
Astronauts eject their poop out of their spaceship. It doesn't pollute space so it's better than bringing it back to Earth.
In space during missions and at their training centers while on earth
Most astronauts have to go to the hospital anyways for a check up before they leave for space. Some astronauts get hurt or injured n space and may need to get tothe hospital when they return. When astronauts get back they have an examination too. Astronauts are highly trained, but they are still human and can get sick or injured like anyone else.
Yes up to 2 inches due to less gravity on their spines. They return back to the mormnal height on earth. It is similar to the effect sleeping has on the spine. On awakening you are 1/2" or so taller than in the evening.
Technically they do not live longer and in other ways they do. If an Astronaut spends enough time in space then time to them will flow slower than it would on earth. When astronauts spend time on the ISS they come back younger as time for them has gone by slower. Yes this is a hard concept to explain
Astronauts usually store their garbage aboard the spacecraft until it can be taken back to Earth for proper disposal. Some waste can be jettisoned into space, but this is regulated to minimize space debris. There are also recycling systems on the International Space Station to minimize waste production.