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However, no correlation was found between the incidence of gamma-ray bursts and cosmic rays, causing the authors to set upper limits as low as 3.4 × 10 −6 × erg·cm −2 on the flux of 1 GeV – 1 TeV cosmic rays from gamma-ray bursts.
Nuclear testing at the Nevada Test Site began with a 1 kiloton of TNT (4.2 TJ) nuclear bomb dropped on Frenchman Flat on January 27, 1951. The last atmospheric test was conducted on July 17, 1962, and the underground testing of weapons continued until September 23, 1992.
On 1 January 2016, 26.2% of persons aged 0–50 had at least one parent born in a foreign country. 11.4% of persons aged 0–50 of 'Dutch background' belonged to the 'third generation', the majority descending from Western immigrants.
The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...