Science

Hello,
The eligibility required for R&D exams is graduation in nutrition and dietitian, post-graduation Diploma in nutrition and dietitian or Master's degree in nutrition and dietitian.
Six months internship (Or 3+3 months) from recognized hospitals or two year experience in a multi-specialty hospital as full time dietician is also required.
Yes, you have one more career option available. You can pursue Masters in food science and then prepare for CSIR NET exam.
The council of scientific and industrial research for the science students, who wants to pursue in-depth research and development in the areas of food science and technology. You can join as a food nutritionist.
Best of luck.

The Indian Institute of Astrophysics is a premier institute devoted to research in astronomy, astrophysics and related physics. You can do B.Sc (Hons.) and join IIA for higher studies to become astronomer.
An astronaut is a person trained by a human space flight program to command, pilot or serve as a crew member of a spacecraft. Although, generally reserved for professional space travelers, the terms are sometimes applied to anyone who travels into space including scientists also. Following are the general eligibility criteria to become astronaut:
(a) Bachelor's degree from a recognised university in engineering, science, or mathematics, etc. An advanced degree is desirable.
(b) At least 1,000 hours pilot-in-command time in jet aircraft. Flight test experience is highly desirable.
(c) Medically fit
India's first two astronauts were from Indian Air Force Fighter Pilot branch.
In India it may be difficult to pursue both careers of astronaut and astronomer simultaneously.