History of the Universe

History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Dates

In this website we show dates in the following formats.

ya means “years ago”.

kya means “thousand years ago”. K stands for kilo, the scientific name for thousand.

mya means “million years ago”. A million is one thousand thousand.

bya means “billion years ago”. One billion is one thousand million.

Note that geologists sometimes use the term Ga, meaning “giga-years ago”, where giga is the scientific name for billion.

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