Diffuse Galaxy NGC 1052-DF2 Photo credit: NASA

When No Evidence Is Good Evidence


The puzzle of dark matter is one of the great conundrums of astrophysics. Part of the puzzle is that it cannot be seen – “dark” in astronomy means invisible. So far, it cannot be detected. It can only be inferred. When you see concentric ripples in a quiet pond, you infer someone threw a rock…