Astronomy

Aerospace engineering is broadly divided into two types of engineering- aeronautical engineering and astronautical engineering
What all can I do after Aeronautical Engineering?
Maintenance of Aircraft - Aerospace Engineers test new aerodynamic and aviation systems and maintain them.
Aircraft Designer - Aerospace Engineers specializing in this field deal with designing, constructing, and testing aircraft, missiles, and spacecrafts. They may conduct basic and applied research to evaluate adaptability of materials and equipment to aircraft design and manufacture.Aviation Engineer- Aerospace engineers in this field deal with the airport design, aircraft navigation technologies and aerodrome planning.
Defence - Aeronautical engineers in this field deal with creation, maintenance and deployment of defence aircrafts such as fighter jets, choppers, bombers, etc.Also, the job requires being able to handle such aircraft at necessary times.
Where all can I work? As everyone here mentioned right, you can work in government sector with ISRO, DRDO, HAL, etc. And then we can look at private companies such as L & T, Godrej and Boyce aerospace, Boeing, Airbus, Mahindra, etc. You can also go for Indian air force and Indian Navy.

Institutes to study cosmology in India:
Institute of Space Science and Technology, Trivandrum
Indian Institute of Astrophysics, Bangalore
Tata Institute of Fundamental Research, Pune
Raman Research Institute, Bangalore
Physical Research laboratory, Ahmedabad
Indian Institute of Sciences, Bangalore
Entrance exams for admission
After completion of 10+2 with Physics, Chemistry and Mathematics subjects you need to apply for entrance exams like JEE Main and Advanced. Clearing JEE Main is very important to GET the nod for JEE Advanced stage. Getting admission in top colleges is only possible if you clear the Advanced stage with a good rank. The above mentioned institutes are the best one and you need to have very good rank to GET admission. For Master's and Ph.D. programme you need to appear for exams like GATE/CSIR NET/JRF to GET admission in a top college.