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Vor einem Tag · History of observations. The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. 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, then finally as a globular cluster in the early 19th ...
Vor einem Tag · Nuclear fusion is a reaction in which two or more atomic nuclei, usually deuterium and tritium (hydrogen isotopes ), combine to form one or more different atomic nuclei and subatomic particles ( neutrons or protons ). The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
Vor einem Tag · Dante is confused as to how, after about an hour and a half of climbing, it is now apparently morning. Virgil explains that it is as a result of passing through the Earth's centre into the Southern Hemisphere, which is twelve hours ahead of Jerusalem, the central city of the Northern Hemisphere (where, therefore, it is currently 7:30 p.m.).
Vor einem Tag · "earth day" will show a bee flying across Earth, which when clicked will start a doodle that Google made in 2020 to celebrate Earth Day's 50th anniversary. [ citation needed ] "fresh prince of bel-air ( see it ) ", in celebration of the 30th anniversary of the TV show 's first airing in 1990, displayed a replica of the "FRESH" license plate in the Knowledge Graph.
Vor einem Tag · Thirty-two astronauts were assigned to fly missions in the Apollo program. Twenty-four of these left Earth's orbit and flew around the Moon between December 1968 and December 1972 (three of them twice). Half of the 24 walked on the Moon's surface, though none of them returned to it after landing once. One of the moonwalkers was a trained geologist.
Vor einem Tag · They are found in water, soil, air, as the microbiome of an organism, hot springs and even deep beneath the Earth's crust in rocks. The number of prokaryotes is estimated to be around five nonillion, or 5 × 10 30, accounting for at least half the biomass on Earth. The biodiversity of the prokaryotes is unknown, but may be very large. A May ...
Vor einem Tag · A replica of Luna 9, the first spacecraft to land on the Moon The first image taken of the far side of the Moon, returned by Luna 3 As part of human exploration of the Moon, numerous space missions have been undertaken to study Earth's natural satellite. Of the Moon landings, Luna 2 of the Soviet Union was the first spacecraft to reach its surface successfully, intentionally impacting the Moon ...
