* Gravity is primarily a field of physics, often studied by physicists or astrophysicists.
* Vaccines are a topic within the field of immunology, often studied by immunologists, virologists, or biomedical researchers.
Someone might study the impact of gravity on vaccine development or distribution, in which case they could be considered a biomedical engineer, physicist, or immunologist depending on their specific focus.
It's important to note that associating someone's expertise with both gravity and vaccines could be misleading. These are very different fields, and an expert in one is unlikely to be an expert in the other.
