Vera Rubin  pioneered research into the theory about dark matter through looking at how galaxies spin. She died on December 25, 2016. I learned about her work when I started reading about the nature of our universe. Rubin discovered that there’s an invisible glue holding all that matter in the universe together. Without dark matter our universe would break apart and spin off into space. Your atoms would be scattered across eternity, nothing would bind you. Everything that you are and everything that you have connected to would be forever out of your reach