be willing to become one. Age is also important, mid-20s to mid-40s being the preferred
range. Natural intelligence is vital, and so is achievement in such fields as engineering,
biological and physical sciences, and mathematics. Candidates are nearly always from a
military background, often because they already have piloting skills, but in some countries,
civilians can also apply. For example, in the USA, the National Aeronautics and Space
Administration (NASA) considers people from a wide range of backgrounds.
C Obviously, applicants are unlikely to have previous space-travel experience when they
attend an interview, but recruiters also look for qualities such as adaptability and
determination. Even after an applicant has got through the first stage of the interview
process, there are still other tests they have to pass. For example, if it is discovered that the
quality of an applicant’s eyesight is poor then, unfortunately, it’s time to go home. There is
a tough physical examination as well. Astronauts need to prove they are in good shape
because if they are eventually chosen to go on a mission, they will have to survive long
months in microgravity, something which can cause uncomfortable swelling in the arms
and legs, and can affect the cardiovascular system.
D Eventually, out of all the applicants that apply, a small group is chosen to attend a two-
year period of study. During this time, they will learn a whole range of new things, such as
a new language (they will have to communicate with other nationalities on the ISS). They
will also have media awareness lessons and special preparation in a simulated zero-gravity
environment. Once they have completed these sessions, the potential astronauts may have
to wait years before being chosen to go up to the ISS. In other words, they need to be
willing and able to depart at any time.