[揽瓜阁精读] 276. 陨石和星云

chen666

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冠冠

謝

Nora小碗

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Nora小碗

main idea: meteoroid introduction
structure:
p1. news about nfer, last 3years, 1st mission
p2.mission details and significance
- one year to spiral to reveal composition
- solve the problem on what the connection between the asteroid and meteoroid
p3.problem faced by scientists
- wrong rocks of meteoroid
- they want the nf can solve once and for all
p4. asteroid live in belt between mars and jupiter
- many 10-1000km across
-numerous smaller ones
- formation: small bodies condensed, never emerge into larger
p5. process of asteroid leaving from belt
- evidence to prove: 1932 started, then observed periodically passed the orbit of earth
p6. asteroids supply always replenished ⬅️ unstable orbit
p7.how escape the belt?
-bodies collide with each other and perturbed by gravity of Jupiter
p8. difference between the comets and asteroid meteoroids
p9.formation of meteriod:
-similar to sun without gas and volatile elements
p10. earth  moon and other planets continue evolvement ??

new words
asteroid: 小行星
meteoroid: 流星体
baffle: 困扰
spawn: 产卵，出生
conundrum: 谜语，令人迷惑的难题
noun between 10 and  1000 km across: 直径10-1000千米的noun
remnant: 残余部分
perturb: 扰乱
they can be propelled out of the asteroid belt: 被推出
fleck: 微粒，小片
presumably: 大概

Naomi_Chen

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JillSun13

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ChaseGkur

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mitxinying2022

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cavalierwow

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lucy宓

一段时间以来，研究人员一直怀疑陨石是由小行星产生的，但还没有人能找到匹配的。问题是，研究人员发现的少数线索似乎排除了最有可能的小行星候选人——它们似乎是由错误的岩石组成的。现在，研究人员希望能够一劳永逸地解决这个难题
。
研究人员说，小行星的供应必须不断补充，因为它们的轨道不稳定。它们很可能在数亿年内与行星相撞、坠入太阳或飞出太阳系——这比太阳系的年龄小得多。所以它们很可能来自主小行星带