6 rules of relative age dating

No one is entirely sure how much of the matter in the universe is presently tied up in black holes, but it’s generally assumed to be a small fraction of the total.

Long story short: when someone says that the universe is 13.8 billion years old, they’re talking about the age of the matter in the universe, almost all of which is effectively the same age.

By and large, the effect from the twin paradox is smaller than the effect from gravity, because if something is traveling faster than the local escape velocity, then it escapes.

So the velocity you plug into gamma for the twin paradox (the physical velocity) is lower than the velocity you’d plug in for gravitational dilation (the escape velocity).

In spacetime geometry, the time between two points is a straight line.

A “straight line” in spacetime includes sitting still, so if you start with two clocks in the same place and take one on a trip that eventually brings it back to its stationary partner, then the traveling clock will have fallen behind its sedentary twin.

When talking about the age of the universe we’re talking about the age of everything in it.

C) dating usually want to know about the radiometric[1] dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.

People wonder how millions of years could be squeezed into the biblical account of history. Christians, by definition, take the statements of Jesus Christ seriously.

Physicist: One of the most profound insights ever made by peoplekind is that time is relative. The existentially terrifying answer is: there is no such thing as a “correct clock”.

This isn’t some abstract idea, mistake, or mathematical artifact. Every clock measures its own time and there is no such thing as a universal time.

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The twin paradox a bizarre consequence of the difference between ordinary geometry and spacetime geometry.

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