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The ISS is far bigger than either the Salyuts or Skylab. In an uncontrolled deorbit, pieces of debris “up to car and train size,” say experts on the official ISS space station advisory committee, will rain down from the sky. NASA confirms this would pose “a significant risk to the public worldwide.”。关于这个话题，爱思助手下载最新版本提供了深入分析
// TDT timestamps。业内人士推荐WPS官方版本下载作为进阶阅读
Alison Francis,Senior Science Journalist