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美國國家航空航天局定期出版電子書,可供免費下載。美國航空航天局的新電子書名爲《哈勃聚焦》。恆星的生活 - 關於哈勃太空望遠鏡。這本新的電子書提供了美國宇航局所說的 "深入研究天文學中的特定主題",哈勃任務改變了這些主題。
NASA regularly publishes e-Books that are available to download for free. NASA's new e-Book is titled Hubble Focus: The Lives of Stars - about the Hubble Space Telescope. The new ebook offers what NASA says is a “dive deeper into specific topics in astronomy” that the Hubble mission changed.
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