Hello,

Aerospace is  a  branch of engineering, where you get to learn design, building, testing and maintenance of civil aircraft, missiles, space shuttles, rockets, space stations and other such units. On the other hand, Aeronautical engineering is a sub division field of Aerospace Engineering and deals with the study of designing and building aircraft such as aeroplanes and helicopters.  In simpler words Aeronautical engineering Relates to machines that fly within the earth’s atmosphere, wheres as Astronautical engineering includes the study related to spacecraft such as rockets, space stations and shuttles.

Good Luck