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Twinkle, Twinkle Little Star

SOURCE: Curious About Astronomy


	Why do stars change their colour constantly every second? red-blue-red-blue...? This is because of scintillation ("Twinkling") as the light passes through the atmosphere of the Earth. As the air moves in and out, the starlight is refracted, often different colors in different directions. Because of this "chromatic abberation," stars can appear to change colors when they are twinkling strongly. Stars twinkle because of turbulence in the atmosphere of the Earth. As the atmosphere churns, the light from the star is refracted in different directions. This causes the star's image to change slightly in brightness and position, hence "twinkle." This is one of the reasons the Hubble telescope is so successful: in space, there is no atmosphere to make the stars twinkle, allowing a much better image to be obtained. Planets do not twinkle the way stars do. In fact, this is a good way of figuring out if a particular object you see in the sky is a planet or a star. The reason is that stars are so far away that they are essentially points of light on the sky, while planets actually have finite size. The size of a planet on the sky in a sense "averages out" the turbulent effects of the atmosphere, presenting a relatively stable image to the eye.

	Shopping Online? Check out the Annual Gift Ideas Lists that UFO Wisconsin put together each year to make your gift giving experience that much easier and way more unique! We've listed the 2012 pages below, but each page is completely updated annually! When the next year's Annual Gift Guide is released, we will link that update on the older pages or just visit our always up-to-date UFO Wisconsin Store page to help support much needed updates to this site, and to show your support for our UFOlogists out there every day helping people!
	The Best Alien & UFO Theme Gift Ideas List for 2012 The Best Alien & UFO Theme Gift Ideas List for 2012
	The Best Outer Space Theme Gift Ideas List for 2012 The Best Outer Space Theme Gift Ideas List for 2012
	The Best Science Fiction Theme Gift Ideas Lists for 2012 The Best Science Fiction Theme Gift Ideas Lists for 2012
	The Best UFO & Alien Christmas Gift Ideas for 2012 The Best UFO & Alien Christmas Gift Ideas for 2012

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