『Venera 4: The Day Venus Lost Its Paradise Myth』のカバーアート

Venera 4: The Day Venus Lost Its Paradise Myth

Venera 4: The Day Venus Lost Its Paradise Myth

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On October 18th, 1967, the Soviet spacecraft Venera 4 plunged into the thick, swirling atmosphere of Venus and became the first probe to directly measure the environment of another planet from within its own skies. After launching in June of that year, the spherical probe descended by parachute, beaming back data on temperature, pressure, and atmospheric composition as it sank deeper into the clouds. What it found was staggering. Scientists on Earth had long imagined Venus as a lush, humid sister planet to our own, perhaps even a tropical paradise hidden beneath its dense cloud cover. Venera 4 shattered that romantic notion within minutes. The probe detected an atmosphere made up overwhelmingly of carbon dioxide, something like ninety-five percent, with only trace amounts of oxygen and water vapor. As it fell, the pressure and heat climbed to such extremes that the spacecraft eventually stopped transmitting, crushed and cooked long before it ever reached the actual surface. At the time, Soviet scientists believed Venera 4 had survived all the way down to the ground, and they announced that the surface temperature was around two hundred eighty degrees Celsius with a pressure about fifteen to twenty times that of Earth. It turned out the probe had actually failed partway through the descent, and the true surface conditions were even more hellish than first reported, with temperatures hovering near four hundred sixty degrees Celsius and pressure roughly ninety times that of our own atmosphere, enough to crush a submarine. Still, this moment on October eighteenth marked a turning point in planetary science. It was humanity's first taste of true data from within an alien atmosphere, and it forced a dramatic rewrite of what Venus actually was: not a twin Earth, but a scorched, crushing, acid-clouded inferno driven by a runaway greenhouse effect. There is something wonderfully poetic about the timing too, because the American probe Mariner 5 zipped past Venus just one day later, on October nineteenth, gathering complementary data from orbit while Venera 4 was doing its daring dive into the clouds below. For a brief moment, two rival space programs, locked in the heat of the Cold War space race, were both staring at the same strange planet from totally different vantage points, piecing together a picture of a world that had fooled astronomers for centuries. Venus had always been called Earth's twin because of its similar size and mass, and before Venera 4, there were serious scientific papers speculating about swamps, oceans, or at least an Earth-like climate underneath those thick clouds. The idea of Venusian rainforests or even primitive life was not just science fiction fodder, it was a legitimate hypothesis. October eighteenth, 1967 is the day that fantasy died, replaced by the far stranger and more fascinating truth of a planet where the atmosphere itself is a crushing, toxic furnace. It is a wonderful reminder that sometimes the universe's reality is far more dramatic than our wildest guesses, and that the only way to really know another world is to go there and stick a probe right into its guts. Some great Deals https://amzn.to/49SJ3Qs For more check out http://www.quietplease.ai
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