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Figure-Based Questions


Use Figure 26.15 to find the two most abundant particles or nuclei in the universe when it was 100 seconds old and when it was 1000 seconds old. What happened between these two times to produce a change in the makeup of the universe?

Suppose 3He and 7Li nuclei were equally abundant in the universe. Use Figure 26.16 to estimate the present density of protons and neutrons in the universe.

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