曾经有人说过,人类对自己居住的地球欠下了一笔科学债。人类受本能的驱使,总是对距离自己遥远的事物充满兴趣,所以对太空探索着了迷。人类对这些遥远星球结构的认识,要比对地球的地心清楚得多。甚至在150年前,人们还不知道我们居住的地球也有一颗跳动的心脏。 It has been said that human beings owe a scientific debt to the earth they live in. Driven by instinct, humans are always interested in things far away from their own, so they are fascinated by space exploration. Human understanding of the structure of these distant planets is much clearer than the earth’s geocentric center. Even before 150 years ago, people did not know that there was a beating heart on the Earth where we live.