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Hi,
YouTube: This is one of the popular ideas. Start your YouTube channel. This will help you to become famous. Once you are famous, then you can join some popular channels like AIB, TVF, etc. I have seen some of the stand-up comedians in a few videos of AIB and TVF.
Reality Shows: If you are really talented at something (dancing, singing etc), then try to participate in reality shows like DID, Indian Idol. This way you will become famous, which will lead you to your dream of becoming an actor/actress.
More reality shows: If you don't have such talent, then try Roadies, Splitsvilla, etc. There are many Roadies, Splitsvillains in Bollywood like Rannvijay, Ayushmann Khurrana, etc.
Modelling: This is one of the classic ways to get entry to Bollywood. You won't believe that Bollywood is filled with models like Aishwarya, Sushmita, Priyanka, John, etc.
Acting School: Join any good acting school. This will provide you with a good platform and help you make some good contacts in Bollywood. Remember me once you become a celebrity.
Best of luck.

To work with NASA, you should have very strong academics, you first have to decide in which field you want to work as there is numerous field in NASA where you can work it is from medical professional to a computer programmer. As you have mentioned, you want to work as a researcher, you should have a degree in one of the core subject of a Science or Maths or have a degree in any applied subject. There is also an internship programme for NASA. Here is the link where you can get all the information:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://m.wikihow.com/Join-NASA?amp=1&ved=2ahUKEwi29cX3tYfaAhVHYo8KHbgXBCUQFjAAegQIAxAB&usg=AOvVaw1n18Ijrr0AXTDU-TuIeD6v&cf=1