Doctor

A neurosurgeon cannot directly become a plastic surgeon. For a change, one would have to undergo an MS or DNB in General Surgery and then MCh/DNB in Plastic Surgery.
It will be another 6–8 years, which is an unusual career change. It is wiser to be a bit more specialised in one's own branch of surgery.

Yes, plastic surgeons can indeed do life-saving surgeries, especially in reconstructive surgery, trauma, and burns. They can salvage a limb, repair facial trauma, and reconstruct following cancer. 
But emergency operations such as cardiac surgeries are beyond their expertise since they are not skilled to perform those. Their lifesaving operations are most often in reconstructive cases that are specialized.

No, an MS Dermatology does not qualify for an MCh in Plastic Surgery. The eligibility route is MS or DNB in General Surgery.
Although non-surgical cosmetic treatments can be performed by dermatologists. The Plastic surgery involves more complicated surgical interventions that require a different postgraduate training background.

No, you can't become a plastic surgeon unless you attend college. Plastic surgery is a very specialised field of medicine that includes formal education, clinical training, and licensure.
You are required to do MBBS, MS/DNB General Surgery and subsequently MCh/DNB Plastic Surgery from a reputable medical college or institute.

The Indian plastic surgeon's salary varies based on experience, employment setting, and healthcare institute. On average, a fresh graduate can earn INR 1.5 to INR 3 Lakh as a monthly income in reputable hospitals or private practice. 

With 5–10 years of experience in the industry, the income can usually go up to INR 4–8 Lacs per month, especially in metropolitan cities or high-end cosmetic surgical centers. Seniors or chief surgeons can earn much higher, based on patient number and specialization.

A physiotherapist is not considered a doctor in the traditional sense like an MBBS or MD professional. Physiotherapists are highly trained healthcare professionals who specialize in rehabilitation, injury prevention, and physical therapy, but they do not hold a medical degree unless they pursue further qualifications like a Doctor of Physical Therapy (DPT) abroad. In India, after completing a Bachelor of Physiotherapy (BPT) or Master's (MPT), they are addressed as therapists, not medical doctors.

Yes, doctors can work at NASA, generally as Flight Surgeons.
These doctors are assigned to each crew and oversee medical care.
Aerospace Medicine: This specialised field involves training astronauts in medical procedures like drawing blood, suturing etc. in zero gravity.
Research and Development: Doctors may also be involved in research related to space medicine and human health in space. 

If you're looking for a medical-related career path without MBBS, several allied health and traditional medicine courses can help you become a healthcare professional.

• Choose BUMS or BSMS: These allow you to become a Unani or Siddha doctor, respectively.

• Go for Veterinary Sciences (BVSc): You can become a veterinary doctor and treat animals.

• Opt for Physiotherapy or Occupational Therapy: While not medical doctors, these fields give you a respected healthcare role.
  

Many medical fields allow students to become certified practitioners or specialists without appearing for NEET. Here are some popular options of Medicine courses that can lead to fulfilling careers.