Bob Carter takes a plane up to 45,000 feet to test an anti-gravity device, but instead it hurls him into the same future as the story “Twilight”—but whereas the earlier story had mankind who were dying out in 7,000,000 A.D. because of the ubiquity of machines, Carter finds himself billions of years beyond that, with both man and (most) machines long gone.
Ah, yes, you have a mathematical means of expression, but no understanding of that time, so it is useless. But the last of humanity was allowed to end before the Sun changed from the original G-O stage—a very, very long time ago.

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  1. “Night,” as by Don Stuart, Astounding, October 1935.
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