I'm two months into an internship at an astrophysical research center. I work for a guy who is designing the active optics system for a large telescope. Active optics is the system that moves the mirrors of the telescope around in real time to account for disturbances in the atmosphere. It's been a lot to learn but super cool so far. I've worked on geometric simulations and ray tracing, which suits me because I prefer a good deal of math in my work. Been using python, C, and CUDA C++.