August 1, 2013 |??
Video of the Week #103, August 1st, 2013:
From: The Beautiful Science of Helicopter Halos by Kyle Hill at Overthinking It.
Source: Fox News.
When a helicopter descends into a sandy environment, it creates a brilliant halo that is a stark contrast to the solemnity of battle. But scientifically, what are these miniature galaxies adorning helicopter blades? It?s due to something called the the Kopp-Etchells Effect. The downward thrust from the blades kicks up a cloud of sand, and the blades smash into millions of these tiny particles. Every so often, the metal blasted from the blades produces a miniature meteor shower.
About the Author: Bora Zivkovic is the Blog Editor at Scientific American, chronobiologist, biology teacher, organizer of ScienceOnline conferences and editor of Open Laboratory anthologies of best science writing on the Web. Follow on Twitter @boraz. More??
The views expressed are those of the author and are not necessarily those of Scientific American.
Source: http://rss.sciam.com/~r/sciam/basic-science/~3/FF170kTxZtg/post.cfm
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