PLAYING IT COOL Molecules are reluctant to chill out, but scientists have taken a step toward making them ultracold. Physicists chilled molecules below a temperature barrier, using lasers and magnetic fields to trap and slow the molecules.
SQUARED OFF Halos around the sun may appear when cube-shaped ice crystals in clouds in the upper atmosphere scatter light (left). In the lab, nearly cubic ice crystals scatter X-rays into similar-looking concentric circles (right).
Left: Pixabay; Right: Courtesy of Ohio State University
CRASH AND FLASH Rumors suggest that LIGO may have detected gravitational waves from a new source: colliding neutron stars (illustrated). Such cataclysms are expected to generate a high-energy flash of light, called a gamma-ray burst (yellow jets). Several telescopes made observations seemingly in search of light from such events.