1.- Do the astronauts suffer vertigo?
Yes, under zero gravity the feel sick because they cannot recognise the new perspective.
2.- Is posible to get pregnant a woman in space?
The effects of zero gravity could really cause problems for foetus development, but it isn't demonstrated.
3.- What are the principal requirements to become an astronaut?
You must have a right personality, you have to be extremely good at dealing with people. You must have a science degree and three years of profesional experience. You have to be between 153 and 190 cm tall and speak good English.
4.- Why do astronauts need to exercise in space?
Because they don't feel the effects of gravity, they don't have to use their muscles for doing everyday activities.
5.- Do you know any instruments to exercise?
The most famous device to do this is the NSD POWERBALL. This is a gyroscope inside of a ball and when you make rotate it with your hand, it can produce a strength equivalent to 18 kg.