Cosmology
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GALACTIC QUARTET The way invisible dark matter warped the light from distant galaxies, shown here as the swirl of material surrounding four giant galaxies in cluster Abell 3827 (seen in this Hubble Space Telescope photograph), suggested that dark matter can separate from stars when galaxies collide. But new data refute that idea.
Richard Massey/Durham Univ., ESA, NASA
FOOL’S GOLD The Nobel Prize is science’s highest honor — but coveting the prize can have negative repercussions. In a new book, astrophysicist Brian Keating describes his personal experience with the award’s allure.
AlphaTangoBravo/Adam Baker/Flickr (CC BY 2.0)