霍金设宴验证时间旅行：宴会结束才寄请柬
Time Travel 霍金讲解关于时间旅行的可行性
Into The Universe With Stephen HawkingTime TravelHello. My name is Stephen Hawking. Physicist, cosmologist, and something of a dreamer. Although I cannot move and I have to speak through a computer. In my mind, I am free. Free to explore the universe and ask the big questions. Such as is time travel possible? Can we open a portal to the past? Or find a shortcut to the future? Can we ultimately use the laws of nature to become masters of time itself? Check it out.Time travel was one considered scientific heresy. I used to avoid talking about it for fear of being labeled a crank. But these days, I’m not so cautious. In fact, I’m more like the people who built stonehenge. I’m obsessed by time. If I had a time machine I’d visit Marilyn Monroe in her prime or drop in on Galileo as he turned his telescope to the heavens. Perhaps I’d even travel to the end of the universe to find out how our whole cosmic story ends. To see how this might be possible, we need to look at time as physicists do as the fourth dimension.It’s n ot as hard as it sounds. All physical objects, even me and my chair, exist in three dimension. Everything has a width and a height and a length. But there is another kind of length——a length in time.While a human may survive for 80 years, these stones will last much longer——for thousands of years. And the solar system will last for billions of years. Everything has a length in time, as well as space. Traveling in time means traveling through this fourth dimension.To see what that means, let’s do a bit of normal every day traveling just to get a feel for it. A fast car makes it a bit more fun. Drive in a straight line, and you’re traveling in one dimension. Turn right or left, and you add the second dimension. Drive up or down a twisty mountain road, and that adds height. So that’s traveling in all three dimensions. But how on earth do we travel in time? How do we find a path through the fourth dimension?Let’s indulge in a little science fiction for a monent. Time-travel movies often feature a vast energy-hungry machine. The machine creates a path through the fourth dimension, a tunnel through time. A time traveler, a brave, perhaps foolhardy individul prepared or who knows what, step into the time tunnle and emerges who know when. The concept may be far-fetched, and the reality may be very different than this, but the idea itself is not so crazy.Physicists have been thinking about tunnels in times, too, but we covered it from a different angle. We wonder if portals to the past or the future could ever be possible within the laws of nature. As it turns out, we think they are. What’s more we even give them a name: wormholes.The truth is the wormholes are all around us, only they are too small to see. Wormholes are very tiny. They accur in nooks and crannies in space and time. You mght find it tough concent, but stay with me. Nothing is flat or solid. If you look cl ose enough at anything, you’ll find holes and crannies in it.It’s a basic physical principle and it even applies to time.Take thi s pool table. The surface looks flat and smooth, but up close, it’s actually anything but. It’s full of gaps and holes. Even something as smooth as a poll ball has tiny crevices, wrinkles, and voids. Now it’s easy to show that this is true in the first three dimensions, but, trust me, it’s also true of the fourth dimension, as well. There tiny crevices, wrinkles, and voids in time. Down at the smallest of scales, smaller even than molecules, smaller than atoms, we get to a place called the quantum foam. This is where wormholes exist. Tiny tunnels, or shortcuts, through space and time constantly form, disappear, and reform within this quantum world. And they actually link two separate places and two diffferent times. Unfortunately, these real-life time tunnels are just a billion trillion trillionths of a cetimeter across——way too small for a human to pass through. But here’s where the notion of wormhole time machines is leading.Some scentists think it may be possible to capture one and enlarge it near tillions of times to make it big enough for a human or even a spaceship to enter. Given enough power and advanced technology, perhaps a giant wormhole could even be constructed in space. I’m not saying it can be done, but if it could be, it would be a truly remarkable device.One end could be here near the earth, and the other far, far away, near some distant planet. Theoretically, a wormhole could do even more. If both ends were in the same place and separeted by time instead of distance, a ship could fly in and come out still near the earth, but in the distant past. Maybe dinosaurs would witness the ship coming in for a landing.Now, I realize that thinking in four dimensions is not easy and that wormholes are a tricky concept to wrap your head around. But han g in there. I’ve thought up a simple experiment that could reveal if human time travel through a wormhole is possible now, or even in the future.I like simple experiments and champagne. So I’ve combined two of my favourite things to see if time travel from the future to the past is possible. I’m throwing a party, a welcome reception for future time travellers. Bu t there’s a twist. I’m not letting anyone know about it until after the party has happened. Here is the invitation, giving the exact coordinates in time and space. I am hoping a piece of it, in one form or another, will survive for many thousands of years. Maybe one day someone living in the future will find the information and use a wormhole time machime to come back to my party, proving that time travel will one day be possible. My time-traveller guests could be arriving any moment now.Five. Four. Three. Two. One! What a shame. I was hoping a future Miss Universe was going to step through the door. So, why didn’t the exper iment work? I think one of the reasons might be because of a well-known problem with time travel to the past——the problem of paradoxes.Paradoxes are fun to think about. The most famous one is usually called the grandfather paradox. I have a new, simpler version I call the mad-scientist paradox. I don’t like the way scientists in movies are often described as mad, but in this case, it’s true. This Jap is determined to create a paradox. Even if it costs him his life. Imagine somehow he’s built a wormhole. A time tunnel that stre tches just oneminute into the past. I may not sound like much, but even one minute of time travel can cause real trouble. Through the wormhole, the scientist can see himself as he was one minute ago. But what if our scentist uses the wormhole to shoot his earlier self? He’s now dead, killed before he’d even finished assembliing the pistol. So, who f ired the shot? It’s a paradox. It just doesn’t make sense. It’s the sort of situation that gives cosmologists nightmares. This kind of time machine would violate a fundamental rule that governs the entire universe——that causes happen before effects and never the other way around. I believe things ca n’t make themselves impossible. I f they could, then there’d nothing to stop the whole universe from descending into chaos. So I think something will always happen that prevents the paradox. Somehow there must be a reason why our scientist will never find themselves in the situatiion where he could shoot himself. And in this case, I’m sorry to say, the wormhole itself is the problem. In the end, I think a wormhole like this one can’t exist. And the reason for that is feedback.If you’ve ever been to a rock gig, you’ll probably recongnize this screeching noise. It’s feedback. What causes it is simple. Sound enters the mic rophone. It’s transmitted along the wires, make lounder by the amplifier, and comes out at the speakers. But if too much of the sound from the speakers go back into the mike, it goes round and round in a loop, getting louder each time. If no one stops it, feedback can destroy the sound system. I think the same thing will happen with a wormhole, only with radiation instead of sound. As soon as the wormhole expands, natural radiation will enter it and end up in a loop. The feedback will become so strong, it destroys the wormhole. So, although tiny wormholes do exist, and it may be possible to inflate one someday, it won’t last long enough to be of use as a time machine. That’s the real reason no one came to the party. In fact, I believe any kind of time travel to the past through wormholes or any other method is probobly impossible. Otherwise, paradoxes would occur. So, sadly, it looks like time travel to the past is never going to happen, a disappointment for dinosaur hunters and a relief for historians. But t he story’s not over yet.This doesn’t make all time travel impossible. I do believe in time travel, time travel to the future.Time flows like a river, and it seems as if each of us is carri ed relentlessly along by time’s current. But time is like a river in another way. It flows at different speeds in different places. And that is the key to traveling into the future. The idea was proposed by Albert Einstein over 100 years ago. He realized that there time slows down and others where time speeds up. He was absolutely right, and the prove is right above our heads, up in the space.This is the Global Positioning System, or GPS. A network of 31 satellites in orbit around the earth. The satellites make satellite navigation possible. But they also reveal that time runs faster up here than it does down on earth. Inside each spacecraft is a very precise clock. But despite being so accurate, they all again around a third of a billionth of a second every day. The system has to correct for the drift. Otherwise that tiny difference would upset the whole system causing every GPS device on earth to go out by about six miles a day. You can just imagine the mayhem that would cause. The problem doesn’t lie with the clocks. They run fast because time itself runs faster here than it does down below, and the reason for this extraordinary effect is the mass of the earth. Einstein realized that matter drags on time, slows it down like the slow part of a river. The heavier the object, the more it drags on time, and this starting reality is what opens the door to the possibility of time travel to the future. I admit this is difficult concept to understand, so let’s take a simple example.This is the Great Pyramid of Giza. It weighs over 40 million tons, and like all heavy things, i t’s actually slowing down time. The effect is small, billions of times smaller than that of the earth. But if we exaggerate it drastically. You can see the principle at work. Close to the pyramid, everything is slowed down, again, like the sluggish part of a river. Here time itself is passing slower compared to how it’s passing further away. But what if people near the pyramid look outwards? They must see the opposite effet. Because they are slowed down, they must see time in the distance as running fast. I t’s a simple result of the mass of the pyramid. This distortion opens the door to the possibility of time travel. So what we need to really travel in time is something much more massive than a pyramid. And I know just the thing.Right in the center of the milky way, 26,000 light-years from us, lies the heaviest object in the entire galaxy, hidden by a vast cloud of gas and stars. It’s a supermassive black hole containing the mass of 4 million suns crushed down into a single point by its own gravity. The closer you get to the black hole, the stronger the gravity. Get really close, and not even light can escape. So it’s wrapped in a sphere of darkness 5 million miles in diameter. A black hole like this one has a dramatic effect on time, slowing it down far more than anything else in the galaxy. That makes it a natural time machine. I like to imagine how a spaceship might someday be able to take advantage of this spectacular phenomenon. Of course it would be to aim just off to the side so they’d miss it. They h ave to be on exactly the right trajectory and speed. Get it right, and the ship would be pulled into orbit, a giant circle 30 million miles in diameter. Here it would br safe. Its speed would be enough to keep it from falling any further in. If a space agency were controlling the mission frome earth or anywhere else far way from the black hole, they’d observe that each full orbit took 16 minutes. But for the brave people on board, close to this massive object, time would be slowed down. And here the effect would be far more extreme than near the pyramid or planet earth. The crew’s time would be slowed down by half. For every 16-minute orbit, they’d only experience 8 minutes of time. Round and round they’d go, experiencing just half the time of everyone far away from the black hole. Tlhe ship and its crew would be traveling through time. Imagine they circle the black hole for 5 of their years, 10 years would pass elsewhere. When they got home, everyone on earth would have aged 5 years more than they had. The crew of the spacecraft would return to a future earth. They would have made a journey not only in space, but in time. So a supermassive black hole is a time machine. But of course it’s not exactly practical. It has advantages over wormholes in that it doesn’t provoke paradoxes. Plus it won’t destroy itself in a flash of feedback. But it’s pretty dangerous. It’s a long way away. And it doesn’t even take us very f ar into the future. Fortunately, there is another way to travel in time, and this represents our last and best hope of building a real time machine.Traveling through the fourth dimension will never be a walk in the park. But it turns out there is a surprisingly straightforward way to do it. You just have to travel very very fast, much faster than eventhe high speed required to keep out of the supermassive black hole. This is because of another strange fact about the universe. There’s a cosmic speed limit——186,000 miles per second, also known as the speed of light. Nothing can exceed that speed. I real ize this sounds weird, but trust me. It’s one of the best established principles in science. Believe it or not, traveling at near the speed of light transports you to the future. To explain why, let’s me dream up a science-fiction transportantion system.Imagine a track that goes right around the earth. A track for a superfast train. We’re going to usethis imaginary train to get as close as possible to the speed of light and see how it becomes time machine. On board are passengers with a one-way ticket to the future. The train begins to accelerate faster and faster. Soon it’s circling the earth over and over again. To approach the speed of light means circling the earth pretty fast. Seven times a second. But no matter how much power the train has, it can n ever quite reach the speed of light since the laws of physics forbid it. Instead, let’s say it gets close, just shy of that ultimate speed. Now something extraordinary happens. Time starts flowing slowly on board relative to the rest of the world just like near the black hole, only more so. Everything on the train is in slow motion. This happens to protect the speed limit, and it’s not hard to see why. Imagine a child running forwards up the train. Her forward speed is added to the speed of train, so could n’t she break the speed limit simply by accedent? The answer is no. the laws of nature prevent the possibility by slowing down time on board. Now she can’t run fast enough to protect the speed limit. And from that fact comes the possibility of traveling large distances into the future. Imagine the train left the station on January 1, 2050. It circles the earth over and over again for 100 years before finally coming to halt on New Year’s Day, 2150. The passengers will have only lived one week because time is slowed down that much inside the train. When they go out, they’d find a very different world than the one they’d left. In one week, they’d have traveled 100 years into the future. Of course, building a train that could reach such a speed is quite impossible. But we have built something very like the train.At the world’s largest particle accelerater at CERN in Geneva, Switzerland. Deep underground, in a circular tunnel 16 miles long, is a stream of trillions of tiny particles. When the power is turned on, they accelerate from zero to 60,000 miles per hour in a fraction of a second. Increase the power, and the particles go faster and faster until they’re whizzing around the tunnel at 11,000 times a second, which is almost the speed of light. But just like the train, they never quite reach that ultimate speed. They can only get to 99.99% of limit. When that happens, they, too, start to travel in time. We know this because of some extremely short-lived particles called pi-mesons. Ordinarily, they disintegrate after just 25 billions of a second. But when they are accelerated to near light speed, they last 30 times longer. These particles are real-life time travelers. It really is that simple. If we want to travel into the future, we just need to go fast. Really fast. And I think the only way we’re ever likely to do that is by going into space.The fastest manned vehicle in history was Appollp 10. It reached 25,000 miles per hour. But to travel in time, we’ll have to go more than 2,000 times faster. And to do th at,we’d need a much bigger ship, a truly enormous machine. The ship would have to be big to carry a huge amount of fuel, enough to accelerate it to nearly the speed of light. Getting to just beneath the cosmic speed limit would require six whole years at full power.Four, three, two, one!The initial acceleration would be gentle because the ship would be so big and heavy. But gradually it would pick up speed and soon would be covering massive distances. It just one week, it would have reached the outer planets, gas giants like Neptune. After tow years, it would reach half light speed and be far outside our solar system. Two years later, it would be traveling at 90% of the speed of light speed and passing our closet star system, Alpha Centauri. Around 30 trillion miles away from the earth, 4years since launch, the ship, two hours pass on earth, a similar situation to the spaceship that orbited the massive black hole. But there’s more to come. After another two years of full thrust, the ship would reach its top speed, 99% of the speed of light. At this speed, a single day on board is a whole year ofearth time. Our ship will be truly flying into the future. The slowing of time has another benefit. It means we could, in theory, travel extraordinary distances within one human lifetime. A trip to the edge of the galaxy would take just 80 years. But the real wonder of our journey is that it reveals just how strange the universe is. It’s a universe where time runs at different rates in different places where tiny wormholes exist all around us and where, ultimately, we might use our understanding of physics to become true voyagers through the fourth dimension.。
时间旅行可以实现 如何建造时光机器【霍金原文】
大家好。
我的名字是斯蒂芬·霍金—物理学家、宇宙论者以及梦想家。
虽然我的身体不能动，要依靠一台计算机说话，但是我的思想是自由的。
我时常在思想的天空中探索宇宙的奥秘，比如“时间旅行可能吗？”、“我们怎么才能找到一条通往未来的隧道或捷径？”、“我们最终能利用自然发展成为时间的主宰吗？”。
时间旅行曾经一度被视为科学狂想。
我也曾经回避对此进行评论，因为担心会被认为是怪人。
但是最近我不再这么谨慎了，我更像是建造巨石阵的那些人们。
我为时间着迷，如果我有一架时间机器，我会去拜访全盛时期的玛丽莲·梦露；我会拜访伽利略，看他将望远镜指向天空。
也许我甚至会去到宇宙的尽头，看看我们那些科幻故事有没有猜对。
要知道时间旅行有没有可能，我们要像物理学家一样思考—在思维层面上思考。
这没有它听上去这么复杂，每一个小学生都知道物体，包括在椅子里的我，都存在于三维空间，都有长、宽、高。
然而，还有另一种长度存在—时间的长度。
一个人可能活80年，巨石阵里的石头则已经矗立几千年了，太阳系会存在几百万年之久。
每一个事物都有一个时间上的长度，就好像在第四维度里面做以时间为计量单位的旅行。
让我们想象我们在做一件普通的事情，开汽车。
开直线的时候我们在一维运动，往右或左拐的时候我们进入了第二维，沿着崎岖的上路上下颠簸的时候我们又加入了第三维，这就是我们如何在三维空间里旅行。
那么我们究竟如何在时间中旅行呢？怎么能早到通往第四维的道路？让我们想一想科幻小说里的情节。
穿越时光的履行通常需要一个巨大、超耗能的机器，它开辟了一条通往第四维的道路。
一位勇敢也许还鲁莽的时光旅行者，他走进了时光隧道，见到很多稀奇古怪的东西。
这些概念看上去很牵强，事实可能完全不是如此，但是这个想法本身却并不是那么疯狂。
物理学家们也思考过时间隧道，不过我们从另一个不同的角度来看。
我们想知道，在自然法则里是否存在通往未来或过去的可能性。
最终，我们决定可能性是存在的。
不要忘了,他始终笑对生活,他已经离开了我们——霍金
不要忘了，他始终笑对生活，他已经离开了我们——霍金本文导读：是的，霍金的传奇色彩似乎是命中注定的，因为他出生的日子1942年1月8日是意大利著名物理学家伽利略诞辰300周年;从1979年到2009年，霍金又担任剑桥大学的卢卡斯数学教授，这个职位的第二任职者就是历史上最伟大的物理学家牛顿。
▲童年霍金(左)霍金的研究课题也跟伽利略、牛顿、爱因斯坦有直接的继承关系——现代天体物理学和宇宙学。
最大贡献是奇点定理和霍金辐射霍金最初在1970年代的研究是关于黑洞的性质，提出了奇点定理和霍金辐射。
黑洞是爱因斯坦广义相对论的产物，奇点则是当物质进入黑洞之后，向中心聚集成为没有大小的“几何点”，具有无限大的密度和能量。
霍金和彭罗斯证明，黑洞中心的奇点是不可避免的，也就是真实存在。
在这样的点上我们现有的物理定律都会失效。
霍金进一步提出，我们的宇宙起源时的大爆炸，实际上可以看成是黑洞奇点的反演。
这个研究推动了早期的宇宙学理论进展。
▲年轻时的霍金。
霍金还发现黑洞面积相当于它的熵，提出了黑洞面积不减定理(这已经被引力波观测所证实)，并结合量子力学提出了黑洞蒸发理论，也就是所谓的霍金辐射。
这个理论指出，由于黑洞附近的量子过程允许从真空里借出部分能量，如果负能量粒子会落到黑洞里面去，黑洞外的正能量粒子逃逸，在我们看来，黑洞就有了辐射，也就是“黑洞不是黑的”。
霍金辐射目前还没有得到证实，这也是其被认为没有获得诺贝尔物理学奖的原因。
▲霍金游览颐和园。
对科学的追求从未止步霍金后期的工作，集中于弦理论，这项研究试图解决当代物理学的一个主要矛盾，即爱因斯坦广义相对论和量子力学之间不能相容的问题。
因为广义相对论描述的是广延时空和运动，而量子力学处理的对象是分立的量子现象，如何把它们统一起来吸引了霍金的研究兴趣。
霍金参与发展了M理论，这种理论认为弦或者膜是组成物质的最基本单元，所有的基本粒子如电子、光子、中微子和夸克都是弦或膜的不同振动激发态。
霍金说过哪些预言(附每个预言的发生时间表)
“霍金预言”并不是指霍金的所有的语言，而是有特定的一个语言与之对应，其大概意义是霍金表示地球将在200年内毁灭，我们的唯一生路就是移民外星球，具体内容跟着来看看吧。
一、预言具体内容据国外媒体报道，著名天体物理学家史蒂芬·霍金警告说，人类要想长期生存，唯一的机会就是搬离地球，并适应新星球上的生活。
除非人类在最近两个世纪内殖民外太空，否则人类将永远从世界上消失。
>>>揭秘：霍金是怎么说话的？霍金在接受一家网站采访时说：“人类在未来数百年里必须认真考虑自己的生存问题。
我看到了人类的危险，过去曾出现过多次人类的生存危机。
发生类似情况的频率还会增加，我们需要十分谨慎地避免这类危机。
但我是一个乐观主义者，如果人类在未来二百年间能成功向外太空扩张，那么我们就能避免灾难。
2010年早些时候，我曾警告说，人类在努力与外太空其他生命形式建立联系时应当谨慎小心，因为我们不能确定他们是否会对人类表示友好。
如果我们是这个星系中唯一的智能生命体，我们应该确保自己得以生存和延续。
但面对地球的有限资源和呈指数形式增长的人口数量，我们长期生存的唯一机会不是留在地球，而是向外太空寻找出路。
在过去的一百年里，我们的科学技术取得了卓越的成就，如果我们想延续进步，就不得不放眼外太空。
这也是我大力支持载人航天飞行研究的原因。
”霍金最后指出，人类有望驾驶宇宙飞船做时光旅行，届时从地球到银河系边缘的漫长路程仅需八十年，这给人类殖民外太空带来了技术上的可能。
>>>霍金生平简介：1岁到75岁的生命是多么璀璨另外，霍金多次警告说，外星人可能会为资源入侵地球。
二、预言时间表2032年地球进入冰河时代，全球气候变暖。
2060年人类必须离开地球。
2100年人类进入外太空，新人种出现。
2215年地球将面临灾难性毁灭。
2600年地球变成炽热的“火球”。
三、预言评论作为英国剑桥大学应用数学及理论物理学系教授，霍金70年代与彭罗斯一起证明了著名的奇性定理，他还单独证明了黑洞的面积定理，即随着时间的增加黑洞的面积不减等著名理论。
霍金：通过虫洞回到过去违反基本规则
霍 金不 久 前在 一篇 探讨 如 何建 造
在 三维 空 间 内。那 么我 们 怎样 才 能实
现 时 间旅 行？ 怎样 才能 发现 穿 越 第四
然 会 因 为 不 能违 反光 速 最 快 的法 则 ， 而 致使 舱 内 的时 间放慢 。霍 金 设想 出
亲 ； 有了你 的父亲 ，你就 不会出生 ； 没 你 没 出生 ，就 没有 人会 把 你祖 父母 杀
死 ； 是 没 有 人 把 你 的 祖 父 母杀 死 ， 若
工 学院 的研 究 人 员希斯 ・ 罗埃德 教 授
和他 的同事 们提 出崭 新 的理 论 ，利 用 量子 隐 形传 输设 备让 你 既能 够进 行 时
这 种 时 光 旅 行 方 式
的 问 题 在 于 ，接近 超 大
黑洞 的危险太 大 。 霍金提 出人类实现 “ 时间旅行 ”伟大梦想的三条路径
一
种 Ｅ常 活 动 ，比如 开车 。 开车 沿直 ｔ
光速 ：时空旅 行的关键
此。 》 《 置
（ 来源 ： 广 州 日 》 《 报 ）
线 行 驶 ，是在 一 维 中旅行 。 向左 转或
我对这个 问题常 常避而 不谈 。但现 在 ，
历 史 上 速 度 最 快 的 载 人 飞 船 “ 波 阿 罗 ” １ 的 ２ ０ 倍 。在 太 空 飞行 数 ０号 ００ 年后 飞 船将 到达 其 最高 速度 一一 相 当
虫洞 就在 我 们 周 围 ，只是 小到 肉
眼无 法看 见 。宇 宙 万物都 会 出现 小 孔
空旅行 同时 又避开 “ 祖父悖 论 ” 。
你就 会存 在 并 回到 过去 且把 你 的祖 父 母杀死 ，于 是矛盾 出现 了。
高智商名人史蒂芬·霍金简介个人资料（2）
高智商名人史蒂芬·霍金简介个人资料(2)时间缝隙至于时光机的关键点，霍金强调就是所谓的“四度空间”，科学家将其命名为“虫洞”。
霍金强调，“虫洞”就在我们四周，只是小到肉眼很难看见，它们存在于空间与时间的裂缝中。
他指出，宇宙万物非平坦或固体状，贴近观察会发现一切物体均会出现小孔或皱纹，这就是基本的物理法则，而且适用于时间。
时间也有细微的裂缝、皱纹及空隙，比分子、原子还细小的空间则被命名为“量子泡沫”，“虫洞”就存在于其中。
史蒂芬·霍金回到过去而科学家们企图穿越空间与时间的极细隧道或快捷方式，则不断在量子天地中形成、消失或改造，它们连结两个不同的空间及时间。
部分科学家认为，有朝一日也许能够抓住“虫洞”，将它无限放大，使人类甚至宇宙飞船可以穿越;另外若动力充足加上完备科技，科学家或许也可以建造一个巨大的“虫洞”。
霍金指出，理论上时光隧道或“虫洞”不只能带着人类前往其他行星，如果虫洞两端位于同一位置，且以时间而非距离间隔，那么宇宙飞船即可飞入，飞出后仍然接近地球，只是进入所谓“遥远的过去”。
因为在4度空间中，10分钟也许是n小时。
不过霍金警告，不要搭时光机回去看历史。
飞去未来史蒂芬·威廉·霍金表示，如果科学家能够建造速度接近光速的宇宙飞船，那么宇宙飞船必然会因为不能违反光速是最大速限的法则，而导致舱内的时间变慢，那么飞行一个星期就等于是地面上的100年，也就相当于飞进未来。
霍金举人造卫星为例，指卫星在轨道运行时，由于受地球重力影响较小，卫星上的时间比地上时间稍快。
由此，霍金就设想出一艘大型极速宇宙船，可在1秒内加速至时速9.7万公里，6年内加速至光速的99.99%，比史上最快的宇宙船阿波罗10号快2000倍。
船上的乘客就是变相飞向未来，作出名副其实的时间旅行。
四度空间即使是在太空中，万物也都有时间的长度，在时间中漫游，意味着穿越该“4度空间”。
霍金举例指出，开车直线行进等于是在“1度空间”中行进，而左转或右转等于加上“2度空间”，至于在曲折蜿蜒的山路上下行进，就等于进入“3度空间”。
时光机已经实现？已经有人穿越成功
时光机已经实现？已经有人穿越成功
【科技讯】8月22日消息。
时光机最早是爱因斯坦提出的，他认为只要人类能够超越光速就可以逆转时空。
当代物理学家霍金则表示，时光机很有可能实现，甚至已经有人成功穿越。
霍金称：时间旅行有可能实现，有人已穿越成功。
霍金和几位非常有名望的物理学家称，时间旅行是可能实现的，而且在曾经就已经发生过。
关于时光旅行爱因斯坦理论中也提到会实现，下面小编带你看下霍金称：时间旅行有可能实现，有人已穿越成功。
霍金称时间旅行只是一种方式是在宇宙中光速行驶，人类只要能够遭成可以在宇宙中光速飞行的太空船人类时间旅行的想法就会变成现实，霍金称在已经有人实现了时间旅行，国际空间站居民Sergei Krikalev拥有在太空中旅行的最长时间记录：803天9小时39分钟。
关于时间旅行的文献参考
时间旅行文献参考时间旅行理论基础1.《时间简史》:斯蒂芬·霍金著，解释了关于时间旅行的物理理论，包括关于黑洞和宇亩起源的观念2.《时空旅行的物理原理》:刘慈欣著，深入解析了时间旅行的科学原理，从相对论的角度探讨了时间旅行的可能性二、时间旅行与物理学1，《物理学的未来》:加来道雄著，其中详细介绍了物理学在时间旅行方面的最新研究进展。
2.《穿越时空的探索》:海伦·麦金太尔著探讨了如何通过物理定律和现象实现时间旅行。
三、时间旅行的科学实验与观察1.《爱因斯坦的时钟:时间的科学和生活的艺术》:乔治·伽莫夫著，深入解析了时间的测量与感知，以及其对生活的影响2.《时间旅行实验与观察》:约翰·贝尔著详细介绍了关于时间旅行的实验设计和观察结果四、时间旅行与文学艺术1.《时间机器》:赫伯特·乔治·威尔斯著，这是关于时间旅行的经典文学作品，通过科幻的想象展现了时间旅行的魅力与困惑。
2.《星际迷航:时空之谜》:吉恩·罗登伯里著，以科幻影视作品的形式展现了时间旅行的多种可能性和其背后的哲学思考。
五、时间旅行对社会的影响1，《时间旅行与社会变革》:凯文·凯利著分析了时间旅行如何影响人类社会的结构和发展。
2，《穿越时空的伦理学》:约翰·斯图尔特著，探讨了时间旅行对道德伦理观念的影响和挑战。
六、时间旅行与哲学思考1.《时间的哲学思考》:大卫,休遵著，深入解析了关于时间的哲学思考，如何影响我们对时间旅行的理解和评价。
2.《存在与时间》:马丁·海德格尔著，对存在与时间的哲学思考，为理解时间旅行提供了哲学基础。
七、时间旅行的伦理与法律问题1.《穿越时空的法律与伦理》:路易斯·阿尔瓦雷斯著，探讨了时间旅行可能引发的法律和伦理问题。
《时空旅行与道德冲突》:帕特里克·登普西著，详细分析了时间旅行在道德层面的挑战和可能的解决方案。
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霍金设宴验证时间旅行：宴会结束才寄请柬
著名物理学家斯蒂芬-霍金举行了一场时间旅行者派对，但没有一个人参加
霍金在派对上耐心等待，等待时间旅行者出现，但结果令他失望
时间旅行者派对的请柬
据国外媒体报道，2009年6月28日，著名物理学家斯蒂芬-霍金曾举行了一场派对，邀请时间旅行者参加。
不过，霍金在派对结束后才寄出请柬。
毫无疑问，这是对时间旅行者的一次终极考验。
不幸的是，时间旅行者对霍金的派对不理不睬，没有一人参加。
霍金将这场派对视为一项实验，没人赏脸则是一个证据，证明时间旅行不可能实现。
据美国科技博客Ars Technica报道，这位《时间简史》作者解释说：“我得出了一项实验证据，证明时间旅行不可能实现。
我为时间旅行者举行了一场派对。
不过，我在派对结束后才寄出请柬。
我等了很长时间，但没有一个人露面。
”霍金在派对现场拍摄了一幅照片。
照片中，霍金一个人坐在房间里，四周是他为时间旅行者准备的烤面包和香槟酒。
他耐心等待，等待时间旅行者推门走进房间。
不过，结果让他失望了。
在时间旅行者派对现场拍摄的视频上传到YouTube 网站。
霍金在接受Ars Technica采访时表示：“爱因斯坦的广义
相对论认为时间旅行可以实现。
我们可以扭曲时空，回到过去。
不过，扭曲时空将产生可怕的辐射，摧毁飞船，甚至有可能摧毁时空。
”
如果能够实现时间旅行，未来或者过去的人可能参加这场派对，询问他对UFO目击事件的看法。
霍金指出：“有证据显示，智能生物的寿命很短，我们可能等不到外星人造访地球的那一天。
我不相信UFO上有外星人。
你觉得我会相信这是政府的阴谋吗？认为他们掩盖证据，将外星人掌握的先进技术据为已有。
”。