Astronomy

1. To enter ISRO at entry level should have either Masters degree in sciences or B.E/B.Tech in any subjects.
2. Written test is above average tough. GATE scores will be added advantage.
3. Selected from above screening will face personal interview which is highly friendly. Emphasis will be to see strength in fundamentals of ones field and ability to connect this in solving problems.
4. A good project work related to any field useful for ISRO activities will be useful, but not essential and give confidence.
5. Prepare for questions like why are you interested in ISRO. For this your prior knowledge in ISRO activities will help.
6. All activities may not be exciting at beginning, but ones ability to do whatever assigned with commitment and being proactive technically will offer excellent opportunities. All the best, you are maker of your own destiny.

Step 1: Obtain a Bachelors degree in Science subject:
This is the first step required to get in to the field of astronomy. After higher secondary, candidate should obtain a Bachelors degree in science subjects such as physics / chemistry/ mathematics. Apart from these, some universities offer under graduation course in Astronomy.
Step 2: Obtain a post graduate degree:
Those who have completed their graduation in Science subjects such as Astronomy or Physics or Chemistry or Mathematics can look for master level courses like M.Sc Astronomy, M.Sc Astronomy and Space Physics, etc.
Step 3: Search for a career in astronomy:
After completing educational programs related to Astronomy, candidate can search for a lucrative career in the field. At entry level one can get in to the role of junior research fellow, research trainee, etc. Job positions exists in firms like NASA, Association of Bangalore Amateur Astronomers (ABAA), Bhabha Atomic Research Centre (BARC), and Indian Space Research Organization (ISRO). Department of Science and Technology, Government of India also offer enough career openings. Inter-University Centre for Astronomy and Astrophysics (IUCAA), Technology Information, Forecasting and Assessment Council (TIFAC), etc. are some other firms offering rewarding jobs in this field.

The Indian Institute of Astrophysics is a premier institute devoted to research in astronomy, astrophysics and related physics.This is a full-time research programme where in the students work towards their Ph.D degree under the supervision of an IIA faculty. Students may join the programme in either the first semester beginning in August or the second semester beginning in January. Entrance examination is held in December followed by interview in January. Students passing the JEST exam are interviewed in May / June. Eligibility criteria for Ph.D at IIA is M.Sc in Mathematics / Applied Physics / Applied Mathematics / Optics and Photonics / Instrumentation / Electronics etc. All around excellent academic performance from 12th to PG will help you in fulfilling your dream.

There are four ways to get admission in IIA : GATE, CSIR NET , JEST and IIAST.
You need minimum 96 percentile in GATE to get selected for the Interview round in IIA.
NET and JEST qualified students can also apply for IIA.
IIAST is a national level exam conducted by IIA. The forms for IIAST comes in September and the exams are in major cities across India on second Saturday of December.
There are two courses available Ph.D and Int. M.Tech- PhD.
For engineers, in the IIAST written exam,they basically ask basic astronomy, EMT, Signals, Digital & Analog electronics, Control systems, Optics and basic 12th standard physics.
Almost 4-5 students selected each year for M.Tech -PhD.
If you have qualified IIAST then you need not to qualify GATE or any other test. At the time of interview, it doesn't matter from which National level test you have come.
To know how to prepare for IIA Interview, you can ask any student of IIA Int. M.Tech-PhD programme. There email IDs are available on IIA website.

No, you can not get into NASA after D Pharma.
You can get into NASA as a Geologist!
I would like to quote legendary astronaut Dr. Sally K. Ride :
"The most important steps that I followed were studying math and Science in school. I was always interested in physics and astronomy and chemistry, and I continued to study those subjects through high school and college on into graduate school. That's what prepared me for being an astronaut; it actually gave me the qualifications to be selected to be an astronaut. I think the advice that I would give to any kids who want to be astronauts is to make sure that they realize that NASA is looking for people with a whole variety of backgrounds: they are looking for medical doctors, microbiologists, geologists, physicists, electrical engineers. So find something that you really like and then pursue it as far as you can and NASA is apt to be interested in that profession."
So yes if you are very much into Geology, you can definitely make your way to NASA.
But before that you should know that,
You need to have an American citizenship.
NASA gives preference to Educators.
So you'll need to plan accordingly.
Now coming to our Indian Space Research Organisation (ISRO)
Oh yes! They too recruit Geologist.
Indian Institute of Remote Sensing (IIRS), a unit of Indian Space Research Organisation (ISRO), is a premier institute for capacity building and research in the field of remote sensing and geoinformatics. The Institute has a multi-disciplinary and problem oriented research agenda focusing on developing land-ocean-atmosphere applications and understanding Earth's surface and subsurface processes using primarily the space-based technologies. The research programmes are intricately linked to overall goal of ISRO towards operationalisation of space-based services for national development.
You should definitely go through this link: Indian Space Research Organisation Recruitment 2015 - 39,100 Salary
It will for sure give you an idea about the requirements for getting into ISRO as a Geologist.
On a lighter note :)