本节目将带我们一起探寻宇宙是如何诞生的，又是如何从一个小点扩张到现在的浩瀚无际。首先我们认识卫星，卫星是指在围绕一颗行星轨道并按闭合轨道做周期性运行的天然天体或人造天体，月球就是最明显的天然卫星的例子。在太阳系里，除水星和金星外，其他行星都有天然卫星。太阳系已知的天然卫星总数（包括构成行星环的较大的碎块）至少有160颗。天然卫星是指环绕行星运转的星球，而行星又环绕着恒星运转。天然卫星的大小不一，彼此差别很大。其中一些直径只有几千米大，还有几个在太空运行的卫星却比水星还大。
This Is The Greatest Story Ever Told, The Creation Of Everything Us. The Programme Investigates How The Universe Came Into Existence Out Of Nothing, And How It Grew From A Miniscule Point, Smaller Than An Atomic Particle, To The Vast Cosmos We See Today.

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In the universe ,everything seems to orbit something, planets orbit stars and moons orbit planets. Some moons are volcanic, but the volcanos are ice; others are awash with great oceans. There may be more habitable moons in our galaxy, than there are habitable planets. Moons tell the unknown stories of our solar system and show us how it all works.

In our own solar system, there are just 8 planets. But orbiting 6 of those planets are moons, lots and lots of moons, more than 300 of them, each one is different, each one a world on its own. While we look at our own solar system, we see a lot of planets, but even more than planets, we see moons. And in many ways, they are more interesting than the planets they go around. We have moons that are airless and apparently dead like ours, but others in our solar system, we have moons with oceans inside them and moon with atmosphere surround them. And I’m for moon and you can keep the planets.

The biggest eruptions, the coldest temperatures and the largest oceans in the solar system,they are all on moons. There are moons with ice volcanos. There are moons with lakes of methane, and metane rainfall, smog, clouds. Moons that are so volcanically active that they keep remaking their surface. Moons with all kinds of plume shooting off into the space. Really, a much wider range of environments than we ever could have imagined.

地球是我们赖以生存的家园，她为我们提供了生存所必需的物质——氧气和水。她用慈母般的温情哺育了一代又一代的人。当我们恣意地享受地球给予的一切时，是否已经了解地球了呢？地球的力量到底有多大！

Of all our planet’s forces, perhaps none has greater power over us than water. For me, water is the most magical force on earth. The presence of water shapes, renews and nourishes our planet.

Oh, my God ! You get all wet there!

It’s our planet’s lifeblood. It pumps through it continuously, delivering vital ingredients for life.

Ah,it’s glorious!

Water makes us alive. Yet, water is just one of the ways that the power of the planet has shaped our lives. The earth has immense power and yet that’s rarely mentioned in our history books. I’m here to change that. I’m exploring four great planetary forces that have influenced our history.

The power of the deep earth; the few technological innovation-wind, that has shaped the fate of entire continents; and fire, which gave us the power to conquer the planet.

But I’m going to start with water, the magic of water is that it’s constantly transforming itself, shifting between guises and from place to place, our struggle to control it has been behind the rise and fall of some of the greatest civilizations on earth.

The center of the Sahara Desert in North Africa, one of the driest places on earth.

I’m over six hours drive from civilization. Temperatures here regularly reach 100 degrees Fahrenheit, but there’s less than half an inch of rainfall each year.

Ah,the whole things are moving. It’s like walking on water.

Yet, hidden amongst these dry dunes are clues that point to the dramatic influence the planet has had on human lives.
I’ve come here because although you’ll never know it, the story of this place is all about water. The clues are etched into that rock face there. Prehistoric rock outdating about 6,000 years in the pattern of the almost unlikely characteristics you’ve ever seen.

Whoa, what is that? Is it a giraffe? It’s a giraffe. Look at that, here is a neck, here is its ear. Look at that, it’s an eye, isn’t it? That’s really natural, isn’t it? And that looks like a giraffe, dipping its head/ and drinking some water. We’ve got a herd of giraffes here.

Looks like two cats. They are fighting. That, what is that? Looks like a figure of, a figure of a man who’s wearing a burqa. And that’s clearly a crocodile which is especially odd here, that’s an aquatic animal. It doesn’t just paddle around. It needs a lot of water to live in. I find all the creatures that are depicted on these rocks are not desert animals. They need wet conditions.

In such a parched wilderness, how can this be? The only explanation is that 6,000 years ago, this place was wet. Once you know what to look for, the evidence is all around.

The Dead Sea is the lowest point on earth and runs more than 50 miles in length and stretches 11 miles across its wildest point, bordering Israel, The West Bank and Jordan. Large sections of the coast are fenced off and sign posted in Hebrew and English: Warning of sinkholes.

The sea’s dropping water levels is leading to dangerous consequences. In April, an Israeli hiker wandered into an area that had no warning signs and was critically injured when he fell into a sinkhole.

“Due to the rapid drop, the ground water are now facing with the salt rock and the salt rock is undergoing a very rapid dissolution. Cavities（空腔） are formed inside and eventually the surface collapses down to these cavities and these are therefore the sinkholes.”

Geologist Eli Raz himself became the victim of a sinkhole several years ago.

“(I) just remembered that I was busy by documenting a new sinkhole, and then suddenly I found myself covered by a pile of avalanche on the bottom of a sinkhole.”

He spent 14 hours at the bottom before his rescue, and even wrote his will, not knowing he would be saved.

“I just can tell you that it was terrible, very frightened and in the first place, in the beginning, I started to write my will without knowing that somebody will find it of course.”

Now Raz is working to save others from the similar fate, leading an effort to map the sinkholes that are spreading on the banks of the saltwater lake.

The formation of the Dead Sea sinkholes are caused by a drop in the sea’s water level due to limited rainfall, the diversion of much needed water from its upstream sources, pollution, and industrial evaporation of water by the Dead Sea mineral industry. As the sea levels drop, high levels of salt are left behind in the soil. When fresh water washes in and dissolves the salts, cavities are created, causing sinkholes.

Detecting potential sinkholes is crucial because they not only damage the environment, but pose a direct threat to the tourist industry and agriculture.

These underground pits can now be better detected by a new monitoring system. The Geophysical Institute（地球物理研究所） of Israel, along with the Geological Survey of Israel, has been trying to locate sinkholes when they are being created and to follow them. The monitoring can help reveal dangerous sinkhole zones in their early stages.

“We developed a methodology of combining geophysical prediction of sinkholes appearing at the Dead Sea costal plane. What we have (as) a problem now is we need to create at least (a) few geophysical teams with the aim of the constant geophysical monitoring of the dangerous area.”

When a sinkhole is deemed dangerous, reportedly, crews can fill it in with cement or initiate its collapse before it would happen naturally.

In the 80 years that records have been kept, the water level in the Dead Sea has dropped by over 65 feet. The sea has shrunk by more than a third. And in the absence of any expensive water replenishment（补充，补给） plan, the sea is expected to shrink to about two thirds of its current size over roughly the next century.