In the Dec. 23 & Jan. 6 SN: Our top stories of 2017, grounded pterosaur hatchlings, protectors of the Dead Sea Scrolls, a counterintuitive metamaterial, neutron star sizing, arrow of time reversed, E. coli in flour and more.
GRAVITATIONAL GUZZLER The black hole powering the quasar J1342+0928 (illustrated) weighs as much as 800 million suns, but it existed when the universe was just 5 percent of its current age. Scientists aren’t sure how black holes grew so big so early.
Robin Dienel, courtesy of the Carnegie Institution for Science
UNEVEN TERRAIN Universe simulations that consider general relativity (one shown) may shift knowledge of the cosmos.
BANG, FLASH Light waves and gravitational waves from a pair of colliding neutron stars reached Earth at almost the same time, ruling out theories about the universe based on predictions that the two kinds of waves might travel at different speeds.
Illustration by Robin Dienel courtesy of the Carnegie Institution for Science