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The most recent two high-precision argon–argon datings dated the eruption to 73,880 ± 320 [6] and 73,700 ± 300 years ago. [7] Five distinct magma bodies were activated within a few centuries before the eruption. [8] [9] The eruption commenced with small and limited air-fall and was directly followed by the main phase of ignimbrite flows. [10]
The proton–proton chain occurs around 9.2 × 10 37 times each second in the core, converting about 3.7 × 10 38 protons into alpha particles (helium nuclei) every second (out of a total of ~8.9 × 10 56 free protons in the Sun), or about 6.2 × 10 11 kg/s.
The technology became much more sophisticated about 1.8 million years ago, [385] with the controlled use of fire beginning around 1 million years ago. [387] [388] The wheel and wheeled vehicles appeared simultaneously in several regions some time in the fourth millennium BC. [68]
The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. [a] The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president, Donald Trump, and vice president, Mike Pence. [9]
The product of Simon Newcomb's J1900.0 mean tropical year of 31 556 925.9747 ephemeris seconds and a speed of light of 299 792.5 km/s produced a light-year of 9.460 530 × 10 15 m (rounded to the seven significant digits in the speed of light) found in several modern sources [10] [11] [12] was probably derived from an old source such as C. W ...
The school system is divided into elementary (six years; ages 6–12), basic (three years; ages 12–15), and secondary (three years; ages 15–18), or alternatively vocational studies (two years). Access to higher education is given to students who have gained a secondary school certificate.
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