The aeronautical engineers study about the science and technology of aircraft and other related subjects that are relevant in the atmosphere of the earth whereas the astronautical engineers besides studying the same subjects of aeronautical engineering also study an additional subject of spacecraft which will perform both in the atmosphere of earth as well as in the space. The aerospace industries which are specialised in either or the aeronautical and astronautical or both such as Sonovision USA prepare and deal with their specialised curriculum for educating and training the learners. The additional subjects for the astronautical engineers are basically quantum and thermodynamic physics, rocket population, space navigation, orbital mechanics etc. The word “aerospace” was introduced in the year 1950 and refers to anything that is relevant to the atmosphere of the earth and outer space.

The word aerospace is the combination of two relative words such as “aero” and “space”. The word aero has its origin in the Greek word “aer” which means the air or gas or atmosphere. Similarly, the word “space” was first used in late 1800 while mentioning about the outer atmosphere of the earth or about the space. However, though space is mostly referred to the outer atmosphere of the earth but can also refer to the atmosphere of the earth. 

On the other hand, the aeronautical refers to building any aircraft or related materials that perform or required in the atmosphere of the earth. The word “aeronautical” was first used in the 1780s in the era of the hot air balloon. Similar to the word “aerospace” the word “aeronautical” is comprised of two words namely “aero” and “nautical”, and the second word “nautical” has also its origin in the Greek word “nautikos” which means anything that is related to sea and ships. However, in this context, though the planes, spaceships and other aircraft do not go in the sea, but they are eventually ships after all.

The concept and word “astronautical” refers to constructing as well as flying of aircraft or spacecraft which will go out of the atmosphere of the earth and enter and travel in the outer space of earth orbit. The people who operate and travel in the spacecraft are called astronauts. The word “astronaut” was first used in the 1920s when going to space was felt possible and necessary. The word “astro” is derived from the Greek word “astro” which means star referring the people or spaceships who travel to the stars or go into the stars.