RIGHT ROUND Dwarf galaxies near the giant galaxy Centaurus A, shown here in a composite of images from three different telescopes, seem to orbit it in an unexpectedly organized loop.
WFI (Optical)/ESO, A. Weiss et al. (Submillimetre)/APEX/ESO/MPIfR, R. Kraft et al. (X-ray)/CfA/CXC/NASA
MANY WORLDS Alternate universes with different laws of physics could still host galaxies, stars and planets, a new study suggests.
DARK COLLAPSE Dark matter is normally thought to form a spherical halo (illustrated in blue) around galaxies like the Milky Way. Two physicists suggest that dark matter could collapse into more complex structures.