“People with a lot more experience than me are struggling with that question. But the idea of a time gradient has a certain explanatory power. If there’s a time differential between us and the universe, ambient radiation reaching the surface of the Earth at any given moment—sunlight, X rays, cosmic radiation—would be speeded up proportionally. And a year’s sunshine condensed into ten seconds would be instantly lethal. So the electromagnetic barrier around the Earth isn’t concealing us, it’s protecting us.
