What fraction of age of earth is encompass by record histoy

Reference no: EM131000377

1. What fraction of the age of the earth is encompassed by recorded history?

2. If the sun's mass is about average, how many stars are there in the Milky Way galaxy?

3. How many times longer than the mean life of an extremely unstable nucleus is the lifetime of a human?

Reference no: EM131000377

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