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We've all felt hungry in the middle of the night – hungry enough, perhaps, to power through an entire pint of Häagen-Dazs, or finish off the half-pizza left in the fridge. But it's safe to assume that few of us have ever been as voracious as the planet Neptune, which may have, according to a paper by Steven Desch quoted by The New Scientist, once slurped up an entire super-Earth and stolen its moon. The energy – let's call it heartburn – left over from the impact, speculates the Arizona State astronomer, may account for both the odd counter-clockwise orbit of the moon Triton and the heat radiating from Neptune, which far exceeds that generated by its similar-sized neighbor, the suddenly appropriately named Uranus. We may assume that Prilosec was not available in convenient asteroid form.

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