Here's why:

* Aerospace engineering encompasses the design, development, and operation of aircraft, spacecraft, and related systems.

* Astronautics is a specialized subfield of aerospace engineering that focuses specifically on spacecraft and space travel. It deals with:

* Spacecraft design and construction

* Spacecraft propulsion systems

* Spacecraft navigation and guidance

* Space mission planning and operations

So, while astronautics is a distinct area of study, it is firmly rooted within the larger field of aerospace engineering.