字幕列表 影片播放 列印英文字幕 This is our world a warm, comfortable, familiar place But walk away from the fire and look up our thoughts soon leave home Are we just insignificant specks? Is the universe welcoming or hostile? We could stand here forever wondering or we could turn our back on this beach, leave home to see the universe, from here to its edge to discover its wonders confront its horrors beautiful new worlds malevolent dark forces the beginning of time the end of the world Would we have the courage to see it through or would we run for home? There is only one way to find out The edge of space only 100km up, just an hour's drive from home Down there, life continues The traffic keeps moving stocks go on trading and Star Trek is still showing But we have to leave all this behind To dip our toe into the vast dark ocean beyond Into the shallows not too far from home onto.. the moon Dozens of astronauts have come this way before us 12 of them have walked on the moon itself Just over 400,000km from home 3 days in a spacecraft So close, it's as if we've barely left home Familiar, safe within the sight of earth It looks like a deserted battlefield bombarded by millions of meteorites and asteroids But it's quieter now It's obvious there have been no major collisions for millions of years This brings back memories the Apollo 11, lunar module Neil Armstrong's first footprints looks like they were made yesterday there is no air to change them They should survive for millions of years may be longer than us Our time is limited We need to take our own giant leap further than any human as ever travels Out of the darkness, a friendly face the goddess of love Venus The morning star, the evening star Sometimes she welcomes the new day in the east others she says good night in the west The planet's spectacular yellow clouds reflect the sunlight That's why this is the solar system's brightest planet a sister to our planet She is about the same size and gravity as earth We should be safe here But the Venus Express space probe is telling us these dazzling clouds are made of deadly sulfuric acid that the planet's atmosphere is choked with carbon dioxide It's ringing alarm bells Venus is one angry goddess The air is noxious, the pressure unbearable and it's hot, approaching 500 degree Celsius Stay too long and we'd be corroded, suffocated, crushed and baked Noting can survive here Like this, it's a Soviet Venera robotic probe its heavy armor has been wrecked by the extreme atmosphere So lovely from earth, up close, this goddess is hideous She is the sister from hell pockmarked by thousands of volcanos All that carbon dioxide in its atmosphere is trapping the sun's heat This is global warming gone wild Before it was cold, maybe Venus was calm more like her sister planet earth If that's true, this could be our planet's future Beginning to think we shouldn't be out here that we should turn back But there's something hypnotic about the sun Like Medusa, too terrible to look at, too powerful to resist luring us onwards, on, like a moth to a flame Dwarfed by, scorched by the sun, it's Mercury Get too close to the sun, this is what happens Temperature swing wildly here At night, it's -170 degrees come midday, it's 400+ burnt, frozen and look at those scars a sign that Mercury had a violent past The Messenger space probe, it's telling us something strange For its size, this little planet has a powerful gravitational pull It must be heavier than it looks It's like a huge ball of iron covered with a thin veneer of rock The core of what was once much larger planet Maybe a stray planet slammed into Mercury blasting away its out layers in a deadly game of cosmic pinball Whole planets on the loose destroying anything in their path, even entire planets and we are in the middle of it: vulnerable, exposed, small everything is telling us to turn back but who could defy this the sun, in all its mesmerizing splendor Our light, our lives Everything we do is controlled by the sun depends on it and more than that it's the Greek god Helios driving his chariot across the sky The Egyptian god Ra, reborn everyday the summer solstice sun rising at Stonehenge For millions of years this was as close as it got to staring into the face of god 150 million kilometers from home a 20-year journey by plane switch it off and it's so far away we wouldn't know about it for a whole 8 minutes It's so big, you could fit a million earths inside it So heavy, its gravity controls the entire solar system But who needs numbers we've got the real thing We see it everyday a familiar face in our sky up close, it's unrecognizable a turbulent sea of incandescent gas The thermometer rises to over 5,000 degrees Down in the core, it's got to be tens of millions of degrees Hot enough to trigger a nuclear reaction turning millions of tons of matter into energy, every second More than all the energy ever made by mankind Back home, we see this energy as light feel it as heat But up close, there is nothing comforting about the sun It's so full of electrical and magnetic activity It's bursting out in this huge incandescent gas loops called prominences Each one releasing more energy than ten million volcanos You could get the earth through one of these loops and still have tens of thousands of kilometers to spare And when they burst through it's exposing a cooler layers below making sunspots They're a fraction cooler than their surroundings it's why they look black but they are still hotter than anything on earth and they are massive too Some of these are at least 50,000km across a solar flare a superheated stream of electrified gas blasting deadly radiation out into space But one day, all this will stop the sun's fuel will be spent When it dies, that will be it for the earth as well This god creates life and destroys it demands we keep our distance This comet has strayed too close It's been boiled away by the sun's heat creating a tail stretches for millions of kilometers It's freezing in here There's no doubt where these comets come from the icy wastes of deep space But look at all these steam, the geysers and dust it's the sun again, melting the comet's frozen heart A kind of vast dirty snowball covered in grimy tar
B2 中高級 宇宙邊緣之旅-國家地理720p.Part 1/7 (Journey To The Edge Of The Universe - National Geographic 720p.Part 1/7) 182 30 Anbe2623 發佈於 2021 年 01 月 14 日 更多分享 分享 收藏 回報 影片單字