1.Astronaut:person than tripulated one vehicle of space.
2.the earn have six parts:part of legs,trunk,gloves,helmet,rucksack and pipe of evacuation.I don't specificaed how many time.
3.I can't find it this information in anywhwere.
4.the astronaut can see cities and structures on earth, and from earth we can also see the station up in the space.
5.you are study engineering,biological science,master's degree:1 year of experience, doctor's degree:3 years of experiece.
6.they sleep a average of two hours less than in space.One dark mask and strap to hold,help us at astronaut to sleep in the iluminated room.
the websites:
http://www.lanasa.net
http//es wikipedia.org
http://ciencia.nasa.gov
http://www.educoweb.com/aeronautica/astronauts.asp