Astrophysics is the branch of astronomy that employs the principles of physics and chemistry "to ascertain the nature of theheavenly bodies, rather than their positions or motions in space.

Production Engineering is a combination of manufacturing technology with management science. A production engineer typically has a wide knowledge of engineering practices and is aware of the management challenges related to production. The goal is to accomplish the production process in the smoothest, most-judicious and most-economic way.

Construction engineering technology is a professional discipline that deals with the designing, planning, construction, and management of infrastructures such as roads,tunnels, bridges, airports, railroads, facilities, buildings, dams, and utilities. These technicians are unique such that they are a cross between civil engineers and construction managers. 

Mechanical engineering is the discipline that applies the principles of engineering, physics, and materials science for the design, analysis, manufacturing, and maintenance of mechanical systems. It is the branch of engineering that involves the design, production, and operation of machinery. It is one of the oldest and broadest of the engineering disciplines.