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The Life Of A Star
一颗恒星的一生
Stars are big balls of gas.
恒星是由气体组成的大球体。
They shine brightly in the sky.
它们在天空中闪耀着明亮的光芒。
Stars have a life cycle.
恒星有自己的生命周期。
They change over time.
随着时间的推移，它们会发生变化。
They are important for the universe.
它们对宇宙非常重要。
Nebula
星云
Stars start in a cloud of gas.
恒星从气体云中诞生。
This cloud is called a nebula.
这种云叫做星云。
Nebulae are colorful and beautiful.
星云色彩斑斓，美丽异常。
Stars are born in nebulae.
恒星诞生于星云中。
They are nurseries for new stars.
星云是新恒星的摇篮。
Protostar
原恒星
A star begins as a protostar.
恒星开始时是原恒星。
It is very young and hot.
它非常年轻且炙热。
Gravity pulls gas together.
引力将气体聚集在一起。
The star starts to shine.
恒星开始发光。
Protostars are the earliest star phase.
原恒星是恒星的最早阶段。
Main Sequence
主序星
Stars spend most time here.
恒星的大部分时间都处于这一阶段。
Our Sun is in this stage.
我们的太阳正处于这个阶段。
Stars burn hydrogen fuel.
恒星燃烧氢气作为燃料。
They shine steady and bright.
它们稳定且明亮地闪耀。
Main sequence is the longest stage.
主序星是最长的阶段。
Red Giant
红巨星
Stars become red giants.
恒星变成红巨星。
They grow very big.
它们变得非常巨大。
They cool and turn red.
它们冷却并变红。
They burn helium fuel.
它们燃烧氦气作为燃料。
Red giants are near the end.
红巨星接近恒星生命的终点。
Planetary Nebula
行星状星云
Red giants shed outer layers.
红巨星脱落外层。
This forms a planetary nebula.
这形成了行星状星云。
It glows in space.
它在太空中发光。
The core is left behind.
核心部分留了下来。
They create beautiful space clouds.
它们创造出美丽的太空云。
White Dwarf
白矮星
The core becomes a white dwarf.
核心变成了白矮星。
It is very small and hot.
它非常小且炙热。
It slowly cools down.
它慢慢冷却。
White dwarfs are very dense.
白矮星的密度非常高。
They are remnants of small stars.
它们是小恒星的残余。
Supernova
超新星
Some stars explode as supernovae.
一些恒星以超新星的形式爆炸。
This happens very quickly.
这发生得非常迅速。
Supernovae are very bright.
超新星非常明亮。
They create new nebulae.
它们创造出新的星云。
They spread elements in space.
它们将元素散布在太空中。
Neutron Star
中子星
Some stars become neutron stars.
一些恒星变成了中子星。
They are very small and dense.
它们非常小且密度高。
They spin very fast.
它们旋转得非常快。
Neutron stars are very strong.
中子星非常强大。
They are remnants of massive stars.
它们是大质量恒星的残余。
Black Hole
黑洞
Some stars become black holes.
一些恒星变成了黑洞。
They have very strong gravity.
它们具有非常强的引力。
Nothing can escape them.
没有什么可以逃脱它们的引力。
Black holes are invisible.
黑洞是看不见的。
They warp space and time.
它们扭曲了时空。
