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现代科技的发展，使我们在宏观尺度上，可以看到120亿光年（1光年=10万亿公里）之遥，而在微观世界中，我们可以观察到原子，甚至可以把它一个个地抓起来，拼装成纳米机器，这就是现在十分时髦的纳米技术。不过遗憾的是，我们对自己居住的这颗行星，却知之甚少。地球是什么？诗
With the development of modern science and technology, we can see 12 billion light years (1 light year = 10 trillion kilometers) away from the macroscopic scale. In the microscopic world, we can observe atoms and we can even take them one by one. Grab it and assemble it into a nanomachine. This is what is now very fashionable nanotechnology. Unfortunately, we know little about the planet we live in. What is the earth? poetry