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It is the most populous country in Europe, and the ninth-most populous country in the world, with a population density of 8.5 inhabitants per square kilometre (22 inhabitants/sq mi). [12] As of 2020, the overall life expectancy in Russia at birth was 71.54 years (66.49 years for males and 76.43 years for females). [2]
Composition. The universe is composed almost completely of dark energy, dark matter, and ordinary matter. Other contents are electromagnetic radiation (estimated to constitute from 0.005% to close to 0.01% of the total mass–energy of the universe) and antimatter.