The neutron star ‘Cassiopeia A’ is cooling at an alarming rate, and the only way that can happen is if the matter in it is turning into a “superfluid,” two teams report. In other news, scientists report that neutron stars are ‘totally badass’ in general. Credit: X-ray: NASA/CXC/xx; Optical: NASA/STScI; Illustration: NASA/CXC/M.Weiss