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- 2023-2-7
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P1:交代事件,引入下文
- NASA’s Deep Impact arrive its target
P2:probe的作用/发射probe的目的
- by observing the crater when hits the comet
- material that the earth and other planet were formed
P3:研究comet的原因
- comets: simpler and more primitive
- comets and planets: formed in same year, same materials
P4:介绍Deep Impact的构造
- mother ship: photos, measurements
- bullet: smash into comet(next day when separate from mother ship)
P5:这项实验的意义
- crater forms and shape of debris cloud: rigidity of comet’s material and how porous it is
- spectrum of light from debris: material’s composition
- amateur: see the light |
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