Do astronomers and astrophysicists now predominantly use the metric system of measurement - when time itself is not divisible by ten - not metric?
Yes, the predominant units are all still metric, althoughcosmologists exploring the earliest instants after the big bangoften use units of planck time instead, but this of cou…rse is stillbased on the metric system. . +++ . The only other two units of time relevant in Astronomy andGeology are the Year and the second, and the Years are counted asindivisible although the second may be divided into its milli- andsmaller divisions for particular calculations. (MORE)