Year of the Comet
Comet C/2011 L4 (PANSTARRS)

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Comet C/2012 S1 (ISON)

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Web Extras

Dark energy: a quirk of gravity?

Large-scale flaws in general relativity could mimic dark energy's effects.
By Steve Nadis
Published: July 24, 2006
It's surprising how attached people have become to dark energy in a short while, given how weird the concept is. But it's still possible dark energy doesn't exist. The effects commonly ascribed to it may illustrate, instead, a breakdown in general relativity on cosmological scales.
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