This video was made by morphing between a number of images captured by Hubble, and shows the "light echo" created by a star burst of unknown origin as it illuminates gas and dust progressively further away from the star. You can picture the flash as an expanding shell... the radius expands at the speed of light, so the apparent diameter is expanding at twice the speed of light. As this shell reaches previously dark gas and dust, those clouds are illuminated, and the light then travels to the observer... the Hubble Telescope. Amazing and awe-inspring. A number of other astronomy-oriented pictures on this post.
And as long as I'm mentioning DRB, I got some good giggles from today's post, ridiculous signs. Following are a pair of examples, out of many
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