恒星的生命周期
Life Cycle of Stars
了解恒星生命周期的基本知识：恒星在由气体和尘埃组成的云团（星云）中诞生，通过氢核聚变发光数百万或数十亿年，最终消亡——大质量恒星会以超新星爆炸结束，较小恒星则会暗淡成白矮星。
Understand the basics of a star’s life cycle: stars are born in clouds of gas and dust (nebulae), shine for millions or billions of years by fusing hydrogen, and eventually die — massive stars explode as supernovae while smaller stars fade into white dwarfs
学习证据 / Evidence
- 描述恒星由称为星云的气体和尘埃云形成
- 说明恒星通过在其核心将氢聚变成氦来产生能量
- 解释大质量恒星会以超新星爆炸的方式终结，而较小恒星会收缩成白矮星
- Describe that stars form from clouds of gas and dust called nebulae
- State that stars produce energy by fusing hydrogen into helium in their cores
- Explain that massive stars end in a supernova explosion while smaller stars shrink to become white dwarfs
评估问题 / Assessment
{{name}}能说明恒星会诞生、存在非常久，最后消亡，并且非常大的恒星最后会爆炸吗？
Can {{name}} explain that stars are born, live for a very long time, and eventually die — and that really big stars can explode at the end?