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.