英语听力：探索发现 科学新发现：我们的大气层-7

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The birth of the solar system created Earth’s earliest atmosphere. Huge quantities of materials orbiting the Sun fused together into proto-planets. Jupiter and Saturn¹ formed into gassy spheres. But on Earth, most of the material condensed into a molten core. The remaining gases bubbled forth² from the liquid rock, forming the first atmosphere. 

 

Our planet’s gravity stopped these gases from drifting off into space. But Earth now had to face the ravages³ of the solar wind, a stream of charged particles thrown out by the Sun. This same wind had a catastrophic effect on Mars. It has stripped the air from the planet’s surface, blasting it deep into space. The Red Planet’s atmosphere is now only a hundredth as thick as Earth’s. 

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