Their views coalesced to form a coherent policy.
Debris from the collision coalesced to form the moon.
Once the molten debris coalesced into the moon, the theory goes, its crust solidified over several hundred million years.
It's the presence of cold dark matter that explains how the young universe went from being smooth to being lumpy, as ordinary matter coalesced first into stars and then into galaxies.
One moment the crust took the form of a shattered windshield, then it coalesced into a jigsaw puzzle, then a ragged map of the world.
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