I'm currently a graduate student in Finland and I'll be moving abroad to study for an MPhil degree. I have knowledge of space plasma physics and computational physics, since I have worked in that field, and some basic knowledge of cosmology. I wanted to ask for advice on how smart it is for one to suggest their own research topic. Since I'll be mainly studying a subject I don't know so much about, cosmology, I would like it to be somewhat related to things I have more knowledge of; plasma physics and computational physics. I know my supervisor would give me a topic if I didn't come up with one.