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nitrogen
on Feb 5, 2014
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Torus-Earth
Wouldn't the planet's atmosphere and oceans fall into the trench?
CanSpice
on Feb 5, 2014
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Yes, which is why you dig the trench deep enough to cover it over again, make it airtight, and pump out all of the atmosphere to make a vacuum torus inside the planet.
drakeandrews
on Feb 5, 2014
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There were either walls on either side of the trench, or the planet was a barren rock to begin with.
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