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do fraz
миллиард летakcenty
posp. aeon (единица геологического времени); billion years; eon (единица геологического времени)
geochr. Ga (MichaelBurov); giga annum (pl.: giga annums MichaelBurov); gigaannum (pl.: gigaannums MichaelBurov); gigayear (MichaelBurov); Gyr (MichaelBurov); Gy (MichaelBurov); one-billion years (MichaelBurov)
nauki prz. Gyr (A billion years or giga-annum (109 years) is a unit of time on the petasecond scale, more precisely equal to 3.16×1016 seconds (or simply 1,000,000,000 years). The terms are used in geology, paleontology, geophysics, astronomy, and physical cosmology. Byr was formerly used in English-language geology and astronomy as a unit of one billion years. Subsequently, the term gigaannum (Ga) has increased in usage, with Gy or Gyr still sometimes used in English-language works (at the risk of confusion with Gy as abbreviation for the gray, a unit of radiation exposure). Astronomers use Gyr or Gy (or Ga, where the a stands for annum, Latin for "year") as the symbol for gigayear. wikipedia.org LyuFi)
миллиардов лет
geochr. Ga (MichaelBurov); Gyr (MichaelBurov); Gy (MichaelBurov)
ropa / r. billion years
миллиард лет: 2 do fraz, 2 tematyki
Astronomia1
Ropa / ropa naftowa1