A “light echo” from a star actually shows light moving


Why Evolution Is True

What you’re seeing in the 50-second video below is not a star exploding, but the movement of light from a star as it bounces off dust and reaches us on Earth. That star emitted a burst of light in 2002, which, as it moved outward, illuminated parts of the dust cloud surrounding the star.  (No, the cloud isn’t moving.) As the light reaches parts of the dust cloud farther from the star, it gets reflected back to Earth in sequence. (By the way, if you want to spend an instructive 15 minutes, read the Wikipedia article on the speed of light, which is pretty good. Did you know that light moves through a diamond at one-third of the speed it moves in a vacuum?)

The video gives four years of time-lapse photos from the Hubble Space Telescope. Since light travels 186,000 miles per second (nearly 300,000 km/sec), you can…

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