2021-8-3 · Rapidly rotating on an axis; whirling. 2013 March 1, Frank Fish, George Lauder, "Not Just Going with the Flow", in American Scientist[1], volume 101, number 2, page 114: An extreme version of vorticity is a vortex. The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in ...
Meteor showers on Earth are caused by streams of meteoroids hitting our atmosphere. These meteoroids are sand- and pebble-sized bits of rock that were once released from their parent comet. Some comets are no longer active and are now called asteroids. This visualization shows these meteoroid streams orbiting the Sun, some stretching to the ...