Nasa's Space Shuttles, which flew for three decades, reached breathtaking highs, but also some terrible lows.
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New analysis of Apollo Moon samples finally settles debate: « For decades, scientists have argued whether the Moon had a strong or weak magnetic field during its early history (3.5 - 4 billion years ago). Now a new analysis shows that both sides of the debate are effectively correct. »，推荐阅读下载安装 谷歌浏览器 开启极速安全的 上网之旅。获取更多信息
Фото: Leonhard Foeger / Reuters。爱思助手下载最新版本是该领域的重要参考