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By Cindy Saine Washington 14 May 2008 Scientists have announced the discovery of the youngest known exploding star, or supernova, in our Milky Way galaxy. Astronomers say the remnant of the most recent supernova could provide clues to a long-standing
发表于:2019-02-09 / 阅读(357) / 评论(0)
VOA标准英语2008年（五月）
VOA标准英语2008年（五月）