This is why experts think it may have survived an uncontrolled descent through Earth's atmosphere.
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BBC InDepth is the home on the website and app for the best analysis, with fresh perspectives that challenge assumptions and deep reporting on the biggest issues of the day. Emma Barnett and John Simpson bring their pick of the most thought-provoking deep reads and analysis, every Saturday. Sign up for the newsletter here。关于这个话题，爱思助手下载最新版本提供了深入分析
What does Neet stand for and how many are there in the UK?