Career

An astronaut is someone who is giving training by the space flight program to work as the pilots.
Qualifying exam
Bachelor's degree in biological Science, Engineering, Mathematics or Physical Science from a recognized university.
They need to obtain any one of the following degrees from renowned institutes like IISC or IIT.
Ph.D (Astrophysics)
Ph.D (Geophysics)
Ph.D (Metaphysics)
After graduation, candidates can appear for the entrance exam which is held by the NASA for the recruitment of scientists, Astronauts etc.
You may also find employment in ISRO
There are many openings in ISRO, which is conducted for the recruitment of scientists, engineers .
In order to join ISRO, you need to clear joint entrance exam by IIT's.
Eligibility to apply:
Should be a citizen of India
You should be at least 21 years of age by the time you join. Age relaxation is there for SC/ST candidates.
Need to be graduate from a recognized university or board.

There are many reasons why some students do not register for a PhD and favour an MPhil. Firstly, an MPhil is sometimes the name for a one-year Masters as is the case at the University of Cambridge. In some education systems like that of Pakistan, the MPhil is a research degree which includes a strong coursework component, which is often a requirement for a PhD applicant. For some disciplines, notably in the humanities, the MPhil is regarded as the most advanced Master's degree.
Other students, unfortunately, do not at the time have the financial means to undertake a PhD but still want to pursue a research degree. Some choose a one-year Masters by Research, and some choose an MPhil which will normally take two years. Sometimes, and although rare, a research degree can be for one's own interest and an MPhil fulfils that personal ambition without the need for PhD.