In the Nov. 25 SN: Charting lumpy space, Bronze Age movers and shakers, T. rex’s slasher arms, gene editor corrects typos, the Great Pyramid hides a void, mosses chronicle Arctic warming, an itty-bitty insect-inspired robot and more.
WATCHING LIKE A HAWC The HAWC experiment near Puebla, Mexico, uses more than 300 tanks of water to detect the signatures of gamma rays. Its new observations have reignited a debate about the source of unexplained antimatter particles from space.
BLACK HOLE BOUNTY Gravitational waves have been spotted from two merging black holes (illustrated above), the fifth reported detection.
Mark Garlick/Science Photo Library/Alamy Stock Photo
HEAT SHIELD Layers of haze in Pluto’s atmosphere, shown here in an image from the New Horizons spacecraft, could radiate heat away from the dwarf planet and cool it down.
New telescopes and spacecraft will soon help researchers scour our galaxy for signs of extraterrestrial life. But what might aliens look like? And if they do exist, why haven’t they returned our calls? These are just some of the questions addressed in the Science News special report “In Search of Aliens” (SN: 4/30/16, p. 24).