1 during what time period do free neutrons disappear, Ask an Expert

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1. During what time period do free neutrons disappear? Explain.

2. Explain how it might be possible to confuse the redshifts from recession velocities with the gravitational redshifts. How can we distinguish the two?

3. Quasars are known to vary in brightness by just a few hours or days. What can we say about the size of these quasars?

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