The metallicity of a star measures the amount of "metals" it has —that is, any element heavier than helium.
恒星的金属度用于表征它含有的“金属”的量——其实是所有比氦重的元素的量。
The metallicity of a star measures the amount of " metals" it has — that is, any element heavier than helium.
恒星的金属度用于表征它含有的“金属”的量——其实是所有比氦重的元素的量。
When a star similar to the sun fuses most of its hydrogen into helium, then the helium into carbon, the star becomes unstable and puffs out into a red giant.
当一颗类日恒星大部分的氢聚变为氦，氦又聚变成碳的时候，它就变得不再稳定，而膨胀成一颗红巨星。
All that carbon and oxygen — byproducts of the helium fusion process — build up in its core. At that point the star will shed its outer layers and the core will form a White Dwarf.
所有氦聚变中的附产物碳和氧在它的核心逐渐积聚，这期间它将失掉较外层物质，核心最终枯萎成为白矮星。
Metallicity is a measure of the relative abundance in a star of elements other than hydrogen and helium.
金属丰度是对恒星内除氢和氦之外元素的相对丰度的度量(天文学中比氦重的元素都叫金属。——译者注)。
HIP 13044b's existence is bit of a mystery too, since it is the first planet of any origin found around a star lacking resources beyond hydrogen and helium.
HIP 13044b的存在还是有点令人费解的。因为它是第一颗被发现起源于恒星周围却除了氢和氦之外缺乏其他金属的行星。
The star used to be like the sun, a "main sequence" star that burns hydrogen by nuclear fusion, producing helium.
这颗恒星曾和太阳一样，是颗“主序星”(“main sequence”)。它通过核聚变燃烧氢，从而产生氦。
Did the star ignite helium at the core, swallow a planet, or swallow a companion star?
星体燃烧了核内的氦，吞并了行星或伴星吗？
Gravity from the larger White Dwarf slowly pulls helium from the surface of its neighbor, and the siphoned gas builds up into a shell around the star.
从较大的白矮星重力缓缓进站从邻国表面氦，而抽走瓦斯积聚成空壳了围绕恒星。
That simplest fusion reaction, four hydrogens into one helium, works for turning a ball of gas like the Sun, 865,000 miles across, into a shining star.
最简单的核聚变反应，即压迫四个氢原子进入一个氦原子，是相当于把一团象太阳一样的气体从865000公里以外推进一颗闪亮的星星。
Astronomers ascribed them to thermonuclear fusion of hydrogen or helium or to the sudden accretion of matter onto the star.
天文学家因此可将其归因于氢或氦的热核融合反应，或是有物质突然被星体吸附而产生的。
When the hydrogen in the shell, too, is exhausted, the star takes to fusing helium there.
当壳层中的氢也燃烧殆尽，恒星便开始融合氦。
When the hydrogen in the shell, too, is exhausted, the star takes to fusing helium there.
当壳层中的氢也燃烧殆尽，恒星便开始融合氦。
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