Hey Yomit

Aerospace engineerig has two branches, One being astronautical and other being aeronautical.

So astronautical engineering is  is a  branch of engineering that focuses on developing spacecraft and aircraft. Some may confuse astronautical and aeronautical engineering.

While they do have some similarities,  astronautical engineering deals primarily with aircraft that function outside the atmosphere of Earth while aeronautical engineering deals with aircraft that only function inside the atmosphere of Earth.

In astronautical engineering,  you will learn thermodynamics, aerodynamics, celestial mechanics, materials, acoustics, propulsion, guidance and control systems, and flight mechanics.

Aeronautical:

The primary job of an Aeronautical Engineer is to devise aircraft and propulsion systems. Syllabus will include mathematics, CAd, thermodynamics, Fluid mechanics,Material Science & Metallurgy , kinematics, Aerodynamics, , aircraft structures,Gas Dynamics , Aircraft Materials , combustion, control, reliability engineering, Space Mechanics and Launch Vehicles, agile manufacturing and more

hope this helped

all the best