Astrography is the art of describing or delineating the stars.
Astrophotography is photography of celestial objects through a telescope. You can do this with any telescope that can be adapted to a camera, but is best done with an instrument that has a clock drive so it can stay aimed at the thing you're photographing. Very large telescopes, like the ones at Palomar Observatory, are only used for astrophotography. There is a word "astrography". It means making a star map or describing the stars.
Many fields of knowledge are drawn upon to construct vessels suitable for space travel. Orbital mechanics or astrodynamics is the study of the motion of rockets and other spacecraft. For a full list of disciplines involved in spacecraft design, see: http://en.wikipedia.org/wiki/Spacecraft_design