November 11, 2016
[A sign on two posts, in the grass in front of a building with windows and double doors, a window on each door, and bars facing outwards. There is a cement walk leading to the doors. On the sign is the text:]
Department of Astrophysics
Yes, everybody has already had the idea, “Maybe there’s no dark matter—Gravity just works differently on large scales!” It sounds good but doesn’t really fit the data.