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2025-07-07 08:51 本頁面
【正文】 ，氦和重元素已經(jīng)遷移出光球，因此現(xiàn)在光球中只有微量的氦，并且重元素也只有原始太陽的 84%，而原恒星的太陽 %是氫， %是氦， %是金屬 [68]。 ? 在太陽內(nèi)部的部分，核聚變將氫轉(zhuǎn)化成氦已經(jīng)修改了組成，所以太陽的最內(nèi)層大約有 60% 是氦，金屬的豐度則沒有改變。因為內(nèi)部是輻射帶，沒有對流 (參見之前的結(jié)構(gòu) )，沒有核聚變的產(chǎn)物從核心上升進入光球 [72]。 ? 前面所述的太陽重元素豐度通常都是使用分光術(shù)測量太陽表面的光球，和測量隕石中沒有被加熱溫度熔化的豐度。這些隕石被認為保留了恒星太陽的組成，因此沒有受到重元素的污染。這兩種方法的結(jié)果是一致的 [13]。 樣例文本 3 ? A plicating factor is that the Sun will increase in size over this timescale. This makes it even more unlikely that the Moon will be able to cause a total eclipse. Therefore, the last total solar eclipse on Earth will occur in slightly less than 600 million years. ? Astronomers Studying an Eclipse painted by Antoine Caron in 1571Historical eclipses are a very valuable resource for historians, in that they allow a few historical events to be dated precisely, from which other dates and a society39。s calendar may be deduced. Aryabhata (476–550) concluded the Heliocentric theory in solar eclipse. A solar eclipse of June 15, 763 BC mentioned in an Assyrian text is important for the Chronology of the Ancient Orient. Also known as the eclipse of Bur Sagale, it is the earliest solar eclipse mentioned in historical sources that has been identified successfully. Perhaps the earliest stillunproven claim is that of archaeologist Bruce Masse asserting on the basis of several ancient flood myths, which mention a total solar eclipse, he links an eclipse that occurred May 10, 2807 BC with a possible meteor impact in
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