Do astronomers and astrophysicists now predominantly use the metric system of measurement - when time itself is not divisible by ten - not metric?

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The second is part of the metric system.
Yes, the predominant units are all still metric, although cosmologists exploring the earliest instants after the big bang often use units of planck time instead, but this of course is still based on the metric system. +++ The only other two units of time relevant in Astronomy and Geology are the Year and the second, and the Years are counted as indivisible although the second may be divided into its milli- and smaller divisions for particular calculations.
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