Hey guys, First time posting. I was thinking of starting an extra credit paper for my Physics 1A course, and was wondering if anybody could think of any noteworthy and recent applications of classical mechanics that I could do some research on. I was thinking of maybe pursuing dark matter as a topic. I know that early "detections" of dark matter relied on observations of the rotational speed of galaxies and galaxy clusters to approximate the mass within, thus discovering the discrepancy between the observable matter in those galaxies and what it should be. Is this still the primary means by which the amount of dark matter in the universe is calculated? Any nudges in any direction are appreciated.