Listening practice: How a dying star built a cosmic lion
High School English Listening Practice.
0:00 / 8:15
本期导览
本期听的是韦布望远镜拍到的 狮子星云。它不是一只狮子，而是一颗低质量恒星在晚年抛出的气体和尘埃。中心留下的白矮星继续加热、推动这些物质，塑造出像面孔、鬃毛和耳朵一样的环与壳。1
第一遍盲听时，抓住这条线：恒星失去外层 → 中心白矮星照亮并推动物质 → 红外线分辨出尘埃和电离气体 → 星云仍在变化，最终会消散。NASA 的介绍说明，这次观测使用了韦布的近红外相机 NIRCam 和中红外仪器 MIRI。2
关键词
planetary nebula：行星状星云lower-mass star：低质量恒星outer layers：外层物质white dwarf：白矮星radiation：辐射ionize：使气体电离dust shell：尘埃壳层comet-like tail：彗星状尾巴disperse：逐渐消散astronomical scale：天文学尺度
长难句抓主干
The white dwarf continues to affect the material around it, while the gas and dust move farther from the center.先抓主干：
The white dwarf continues to affect the material，意思是「白矮星继续影响周围物质」。while 后面补充同时发生的另一件事：气体和尘埃继续远离中心。这里的 while 主要表示两个过程并行，不要急着把后半句理解成转折结论。事实边界
狮子只是形状上的昵称，不代表星云里真的有动物。韦布图像展示的是气体和尘埃的结构，以及白矮星对它们的影响；研究人员据此判断这个星云仍在膨胀，并估计它大约一万年后会消散。1
References
- 1Lion Nebula roars to life for Webb
esawebb.org
- 2Lion Nebula roars to life with NASA's Webb
science.nasa.gov
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