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Dr. SCHAWINSKI: The reason we call it a ghost is because we believe it is something called a light echo.
NPR: What Makes Our Solar System Special?
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It's what we call a light echo, an effect that we've seen around supernovas - stars that explode - and because of the vast scales involved, the speed of light is actually very slow.
NPR: What Makes Our Solar System Special?
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So too, in light of the politically correct echo chamber that governs university politics and appointments, it is eminently reasonable to assume that an article about these subjects would be harshly treated in peer-reviews.
CENTERFORSECURITYPOLICY: Yale, Jews, and Double Standards
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An echo of the pallid light captured by painters, or an extension of the linen Flanders was famous for producing, the palette is calm and elegant though to some it's simply dull.
CNN: Flanders: Europe's best-kept design secret
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Instead, it crests, fades to a light linger, then builds up to a second echo of the first bold attack.
FORBES: Making 46: Maker's Mark Produces First New Bourbon In Half A Century
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And so, you can actually, like, in an echo in sound, you can see the light moving outwards.
NPR: What Makes Our Solar System Special?
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First presented on 11 March, 2002, and shown annually on 11 September ever since, the tribute consists of 88 7, 000-watt xenon light bulbs placed on a roof near the WTC site in two 48-foot squares that echo the shape and orientation of the twin towers.
BBC: 11 September history tour of New York