Using supercomputers at the National Energy Research Scientific Computing Center (NERSC), Sukanya Chakrabarti, a professor of physics at Florida Atlantic University and an Institute for Theory and Computation (ITC) Fellow at the Harvard-Smithsonian Center for Astrophysics, developed a mathematical method to uncover “dark” satellites. When she applied this method to our own Milky Way galaxy, Chakrabarti discovered a faint satellite might be lurking on the opposite side of the galaxy from Earth, approximately 300,000 light-years from the galactic center.