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Perhaps a challenge for you, prove to yourself time, and space as independent things are linear.

If, at a location that is stationary relative to Earth, I measure time; then, later measure it again, at the same location; if I compare the measurements I might conclude that time is linear.

If I do the same thing, but take the first measurement in deep space, and the second in the gravity well of a planet, I might conclude that time is non-linear.

Therefore, I might reason that time is linear locally, but non-linear globally. OK, I see a problem arising there, but one step at a time.

There never was nothing.