Short shafts of dying sunlight mingled with the deepening grey, lavendering the horizon, and all nature seemed to hush as though waiting to welcome the night.
Ahhh, the ultimate paradox of time travel. Excuse my français, but isn't the space-time continuium a bitch?
When not otherwise noted, zero will mean positive zero here.
zero
positive zero
Also, both hydrogen and helium (the next-lightest gas) would require weighty cooling systems to keep them storably liquid.
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