When a star runs out of fuel, it sheds its outer layers of gas and, if it doesn't explode in a supernova, forms a glowing shell of ionized gas that expands into space. Shells like these are known as ...

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Residents of Swaffham, a town in Norfolk, England, witnessed the mesmerizing sight of a murmuration of starlings weaving shapes in the sky. In footage filmed by Alison Jane Dover and posted to Twitter ...