Beautiful isn't it? The only home we've ever known. But what if the only way to save the Earth was to push it somewhere else? Could we do that? Let's get technical. It is freezing out here. (upbeat music) Life, as we know it, dependson two million septillion kilograms of mostly hydrogen and helium that forms an almost perfect sphere that we humans call the sun. And because we are sodependent on the suns energy, life on Earth has a time limit. In a little over seven billion years, the sun will have burnedthrough enough of its hydrogen and helium fuel that it'll move into another stage of itslife, the red giant stage, and expand so much so that the Earth and all the inner planets will be consumed by just its radius. And that, as they say, will be that. How could we escape such a scorching fate? Well that is the centralquestion in the novella and recent Chinese blockbuster,"The Wandering Earth". And that story's solution is to construct thousands of rocket...

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