⭐ 恒星演化：恒星的一生⭐ Stellar Evolution: the Life of a Star
上一片数完了太阳系的石头。今晚星空向导把时光拨快，看一颗恒星从出生到谢幕的一生——原来恒星也会变老。Last leaf we counted the solar system's rocks. Tonight the star guide fast-forwards time to watch one star live its whole life, birth to finale — stars grow old too.
第 1 步：一生四站Step 1: Four stops of a life
先跟向导走完这条路——恒星从哪来，到哪去？Walk the whole road with the guide first — where do stars come from, and where do they go?
恒星生在星云里，成年后在主序星位置发光几十亿年，晚年胀成红巨星。最后分两条路：小个子缩成白矮星，大块头塌成黑洞。Stars are born in nebulas, spend billions of years shining as main-sequence adults, then bloat into red giants. The road then forks: small ones shrink into white dwarfs, heavy ones collapse into black holes.
同样是恒星，结局为什么不一样？我们的太阳又会怎样？Same kind of star — so why different endings? And what about our Sun?
第 2 步：质量定命运Step 2: Mass decides fate
出生时的质量说了算：8 个太阳以下的，烧完留一颗白矮星；以上的爆成超新星，留下中子星或黑洞。太阳 50 亿年后变红巨星，吞掉水星金星，地球也被烤焦。Birth mass calls it: under about 8 Suns ends as a white dwarf; above explodes as a supernova, leaving a neutron star or black hole. Our Sun becomes a red giant in 5 billion years, swallowing Mercury and Venus — and scorching Earth.
天文学家把恒星排排坐，画出了一张座位表。Astronomers sat all the stars down in rows and drew up a seating chart.
第 3 步：赫罗图Step 3: The H-R seating chart
按亮度和颜色一摆：主序星排成一条斜带，红巨星聚在右上角，白矮星缩在左下角。一眼看出谁年轻、谁快谢幕。Sort stars by brightness and colour: main-sequence stars line up in a diagonal band, red giants gather top-right, white dwarfs huddle bottom-left. One glance tells you who is young and who is nearly done.
🎮 判一判恒星归宿（30 秒）🎮 Judge each star's fate (30 seconds)
道理讲完了。先拖质量滑块，看不同恒星的一生路径怎么走；再判 4 颗星的归宿。Theory done. First drag the mass slider to walk different stars' life paths; then judge the fate of 4 stars.
一句话记住它：恒星一生走星云、主序星、红巨星到归宿；质量定命运，8 个太阳是分界；太阳 50 亿年后变红巨星；赫罗图是恒星的座位表。Remember it in one line: a star walks nebula, main sequence, red giant, then its fate; mass decides, 8 Suns is the divide; our Sun becomes a red giant in 5 billion years; the H-R diagram is the stars' seating chart.
一生四站：星云出生，主序星成年，红巨星变老，再到归宿Four stops: born in a nebula, adult on the main sequence, old as a red giant, then its fate质量定命运：8 个太阳以下变白矮星，以上爆超新星留中子星或黑洞Mass decides: under 8 Suns a white dwarf; above, a supernova leaving a neutron star or black hole太阳的未来是红巨星；赫罗图一眼看出恒星的年龄座位The Sun's future is a red giant; the H-R chart seats every star by age
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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