To celebrate Dark Matter Day, follow our flow chart to work out what this mysterious stuff could be
Read article: Try the Physics World dark-matter flowchart: what kind do you prefer?
Gravitational lensing study puts upper limit on black-hole contribution
Read article: Supernovae reveal that primordial black holes cannot account for all dark matter
Debate intensifies over hypothesis that mystery interaction cooled ancient hydrogen gas
Read article: Did dark matter have a chilling effect on the early universe?
20 years after discovering that the universe is expanding with increasing speed, scientists still argue about whether dark energy explains it. Keith Cooper explores the debate
Read article: The dark-energy deniers
Tiny electric charges may have cooled primordial hydrogen
Read article: Charged dark matter could explain chill in early universe
Discovery could strengthen the case for dark matter
Read article: Galaxy devoid of dark matter puzzles astronomers
Did dark matter interact in the early universe?
Read article: Ancient hydrogen reveals clues to dark matter’s identity
Latest observation concurs with previous studies of the Milky Way and Andromeda
Read article: Satellite galaxies of Centaurus A defy dark-matter model
"Dark decay" could leave traces in existing experiments
Read article: Neutron anomaly might point to dark matter
HAWC observations discount nearby pulsar sources
Read article: Excess positrons could come from dark matter after all
