You would need to get your degree in Astronomy. Meaning going to college. Most astronomypositions require a Ph.D. in the field of astronomy, which usually takes 5-7 years to complete. These programs are likely to contain courses in astrophysics, stellar and planetary physics, galaxies, cosmology, interstellar medium and optics. Mathematics and computer science are also emphasized.
It is saying that the army can’t demand and force you to accept them and feed them in your own house in war or peace but if you give them consent (permission) then they can.
