EVERY AXION HAS ITS DAY Physicist Gray Rybka of the University of Washington in Seattle and colleagues have created a detector sensitive enough to potentially find hypothetical dark matter particles called axions.
Mark Stone/University of Washington
DARK DEFICIENCY Dark matter is unexpectedly absent from the galaxy NGC1052–DF2 (central ghostly blob), an ultradiffuse galaxy about 65 million light-years from Earth in the constellation Cetus.
P. van Dokkum, R. Abraham, STScI
ANTIMATTER MYSTERY Physicists suspect that the neutrino may be its own antiparticle. Experiments such as GERDA (shown) are attempting to determine whether that hunch is correct by searching for a rare type of nuclear decay.