In the Feb. 18 SN: Anniversary of a celebrity supernova, readying for the next stellar explosion, human-animal chimeras, hottest year on record, molecules tied in knots, cancer results don’t reproduce and more.
HELIUM COMPOUND Scientists created a chemical compound of helium and sodium by squeezing the elements to extremely high pressures. Helium atoms (green cubes) are arranged in a 3-D checkerboard structure, each surrounded by eight sodium atoms (purple). Electron pairs (red) sit in the spaces between helium atoms.
Courtesy of A.R. Oganov
WAVE GOODBYE Firing a pair of sound waves at a tsunami, like this one that hit Japan in 2011, could weaken the wall of water and decrease its height, a researcher proposes.
BRIGHT AND EARLY Scientists caught an early glimpse of an exploding star in the galaxy NGC7610 (shown before the supernova). Light from the explosion revealed that gas (orange) surrounded the star, indicating that the star spurted out gas in advance of the blast.