Suppose you suddenly learned that the Earth was 9 billion years old instead of 4.5 billion years…

Suppose you suddenly learned that the Earth was 9 billion
years old instead of 4.5 billion years old. How many times more U-235 would
there have been 9 billion years ago than there is today?

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Some elements of an intermediate atomic weight are produced
by combining lighter elements together in the cores of stars. What is this
process of element formation called?

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