Viking mission

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Viking mission발음듣기

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[Voiceover] Coinciding with America's Bicentennial the Viking spacecraft would be launched on a journey to Mars in search of answers.발음듣기

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The program called for four spacecraft, two to orbit the planet and two to land on the surface.발음듣기

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The Viking program was the largest, most intensive planetary expedition NASA had ever embarked upon.발음듣기

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Preparations for the mission demanded years of research and development and the efforts of thousands of individuals.발음듣기

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Viking's primary mission: search for life.발음듣기

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On earlier missions, the mariners unveiled the barren surface of Mars, extinguishing ideas of highly civilized communities living on the planet.발음듣기

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However, the mariners were above the surface, not on it.발음듣기

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Was there something being left unseen?발음듣기

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We could get closer and with better cameras.발음듣기

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It was time for another look.발음듣기

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On August twentieth nineteen seventy five, a titan centaur launched Viking one into space on a mission to mars.발음듣기

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About two weeks later, Viking two followed its path to the red planet.발음듣기

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For almost a year, the world waited.발음듣기

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Of all the planets in our solar system, Mars and Earth are the most similar.발음듣기

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For this reason, many scientists feel that learning about Mars is absolutely necessary in order to better understand out planet, Earth.발음듣기

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They call it comparative planetology. The Viking mission was to them a sort of quest for the holy grail.발음듣기

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A mission of extreme importance. The pursuit of long searched for highly speculative historical evidence.발음듣기

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While the Vikings travel to their destination over million miles away, the world buzzed with excitement, anticipating their arrival.발음듣기

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This was, after all, a new frontier about to be discovered.발음듣기

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Now it was no longer just the talk of science fiction.발음듣기

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A spacecraft was about to land on another planet.발음듣기

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On June nineteenth, nineteen seventy six Viking one arrived at the planet Mars and immediately began sending back photographs.발음듣기

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One hundred and thirty four thousand bits of information arrived every second.발음듣기

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Viking's first lander touched down on Chryse Planitia on July twentieth, one month later.발음듣기

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Viking two joined them on August seventh and its lander targeted for Eutopia Planitia landed on September third.발음듣기

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For the next six years, the Viking mission would take over fifty five thousand photographs sending to Earth images of volcanoes, dust storms, evolving polar regions, and immense canyons.발음듣기

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Evidence of lake beds, stream channels, and lava planes painted a picture of a very different Mars from a time long ago.발음듣기

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The landers performed a multitude of experiments, biological and chemical, day after day for over three martian years, digging, retrieving, and analyzing.발음듣기

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And yet not one trace of organic material was found.발음듣기

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And so, many who held great expectations for the discovery of life on Mars were let down, left disappointed.발음듣기

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However, for each question that the Viking mission answered, there was a new question born.발음듣기

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Questions so tantalizing that soon after we received Viking's final message in November of nineteen eighty two, scientists anxiously began planning a return trip to the red planet.발음듣기

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(wind blowing) (upbeat music) [Jon] Hello and welcome to Kennedy Space Center.발음듣기

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NASA's home for launching humans--발음듣기

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