Start off your new year with a course on Brilliant! Start learning for free at https://brilliant.org/sabine/ and get a 30-day free trial plus 20% off a premium subscription, which includes daily unlimited access! Physicists don’t actually know what the universe is really made of. The currently most popular theory is that most of the universe is made of dark matter, a mysterious type of matter that we can only detect through its gravitational pull on other objects. But according to a new paper,