47. Scientists studying historical weather patterns have discovered that in the mid-sixth century, Earth suddenly became significantly cooler. Although few historical records survive from that time, some accounts found both in Asia and Europe mention a dimming of the sun and extremely cold temperatures. Either a huge volcanic eruption or a large meteorite colliding with Earth could have created a large dust cloud throughout Earth's atmosphere that would have been capable of blocking enough sunlight to lower global temperatures significantly. A large meteorite collision, however, would probably create a sudden bright flash of light, and no extant historical records of the time mention such a flash. Some surviving Asian historical records of the time, however, mention a loud boom that would be consistent with a volcanic eruption. Therefore, the cooling was probably caused by a volcanic eruption.
1.没有现存的历史记录这样的强闪光，不代表这样的闪光不存在。有可能是当时没有记录的工具。也有可能这些记录已经被损坏或者还没有被发现。
2.一些现存的亚洲历史记录提到了巨大的轰隆声。但是这些声音可能出现在陨石碰撞之后，即便是同时出现，也可能没有因果关系。
3.除了这两种情况，有没有其他的可能。例如地震...
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