"We know that very well from later periods, but in this very formative period of history, it's not very well understood. So it's a really exciting opportunity."
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The EU Space Surveillance and Tracking centre (SST) said one fragment - believed to be the lander - "most likely" re-entered the atmosphere at about 06:16 GMT (07:16 BST) on Saturday.，更多细节参见51吃瓜
number of rounds so that the memory is under control: