About this episode
我们的IEP老师给我们介绍了一个惊人的事实：地球磁场在逐渐消失！如果地球磁场消失，那么以前因地球磁场作用而被阻挡的太阳辐射就会危害地球，人类很有可能像恐龙一样被灭绝。类似事件曾经在火星上发生过。火星原来曾有磁场，也有厚厚的大气层保护，因此也有生命。但后来因磁场消失所有生命都灭绝了。至于磁场消失的原因，大家可以在网上搜索一下。
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