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.
THIRD ROCK The keen eye of an AI program discovered that the star system Kepler 90, illustrated here, has an eighth world (dubbed Kepler 90i), which was previously overlooked in exoplanet searches.
Wendy Stenzel/Ames Research Center/NASA
SEVEN IN ONE GO The small, cool star TRAPPIST-1, illustrated here, hosts a bevy of Earth-sized planets. There could be many more stars like it worth studying.
NOT LIKE HOME Rocky super-Earth 55 Cancri e, seen in this artist’s illustration, is about Earth’s size, but a new study suggests it and other similar hot exoplanets probably formed in a completely different way than Earth did.