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the giant galaxy Centaurus A

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.

illustration of alternate universes

MANY WORLDS  Alternate universes with different laws of physics could still host galaxies, stars and planets, a new study suggests.  

dark matter halo

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.

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