History of the Universe
History of the Universe eBook. 398 pages, 300 illustrations only $2.99
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In this website we show dates in the
means “years ago”.
means “thousand years ago”. K stands for
kilo, the scientific name for thousand.
means “million years ago”. A million is one
means “billion years ago”. One billion is one
Note that geologists sometimes use the term
Ga, meaning “giga-years ago”, where giga
is the scientific name for billion.
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