Star-shaped gravity waves

Researchers have discovered a new type of gravity wave, one that is shaped like a star. Source: live Science

Star-shaped waves can form in vibrating tanks of liquid oil, researchers say.
Learning more about such bizarre waves could shed light on counterparts that may exist elsewhere in nature, researchers added.
To uncover new, remarkable nonlinear waves, scientists experimented with circular and rectangular tanks containing about two-fifths of an inch (1 centimeter) of silicon oil. Researchers placed the tanks on shakers to vibrate the fluid. Scientists then observed that the liquid contained gravity waves oscillations due to gravity pulling downward and vibrations pushing upward.