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From Hilbert Space to Dilbert Space

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Comet Churymov-Gerasimenko compared to Los Angeles
hourglass nebula, eye
From Tom Chivers. This comet is currently being visited by the ESA's Rosetta Spacecraft.

"That's an idealised image, of course. In reality it would probably look more like this"

Some astronomers think this comet looks like a certain object from Sesame Street, which leads to the question: If the rubber ducky is 4 km across, HOW BIG IS THE ERNIE?