Class Notes (1,100,000)
CA (650,000)
UTSC (30,000)
Astronomy (100)
ASTA01H3 (100)
Lecture 18

ASTA01H3 Lecture Notes - Lecture 18: Terrestrial Planet, Planetary Science, Outer Core


Department
Astronomy
Course Code
ASTA01H3
Professor
Kristen Menou
Lecture
18

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Chapte 
Copaatie Plaetolog of the Teestial Plaets
Letue  – Teestial plaets The Eath
The opaiso of oe plaet ith aothe is alled opaatie plaetolog 比較
行星學.
It is oe of the est as to aalze the olds i ou sola sste.
A Tael Guide to the Teestial Plaets
I this hapte, ou ill isit fie Eathlikeolds.
This peliia 初步的 setio ill e ou guide to ipotat featues ad
opaisos.
Fie Wolds
You ae aout to isit Eath, Eaths oo, Meu, Veus, ad Mas.
It a supise ou that the Moo is o ou itiea 旅程.
Afte all, it is just a atual satellite oitig Eath ad is’t oe of the plaets.
The Moo is a fasiatig old of its o.
It is a plaetlike ojet to-thids the size of Meu.
It akes a stikig 顯著的 opaiso ith the othe olds o ou list.
The fist featue to otie is diaete.
The Moo is sall.
Meu is ot uh igge.
Eath ad Veus ae lage ad siila i size to eah othe.
Mas, is a ediu-sized old
You ill disoe that size is a itial 極重要的 fato i deteiig a old’s
pesoalit.
“all olds ted to e iteall 內心 old ad geologiall 地質上 dead.
Hoee, lage olds a e geologiall atie.
Meu is slightl oe tha a thid the diaete of Eath, has o atosphee, ad
is heail ateed 有坑洞的
Plaet Eath, the asis fo the opaatie plaetolog of the Teestial plaets, is a
ate old. It is idel oeed  liuid ate, has pola aps 極冠 of solid ate,
ad has a atosphee ih i ate apou 水氣 ad ate-doplet louds
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Eath’s oo is ol oe-foth Eath’s diaete. It is ailess ad heail ateed
Mas, slightl oe tha half Eath’s diaete, has a thi atosphee ad a ok,
ateed ust aked  olaoes ad old laa 熔岩 flos
Radio-aelegth adiatio a peetate 穿透 the louds, ad ada aps of the
sufae of Veus eeal ipat ates, olaoes, ad solidified laa flos
Veus,  peet the diaete of Eath, has a thik, loud atosphee that hides
its sufae fo ie. “ee though a Eath-ased telesope, it is a featueless hite
all
Coe 地核, Matle 地函, ad Cust 地殼
The teestial olds ae ade up of ok ad etal.
The ae all diffeetiated:
Rok, lo-desit usts,
High-desit etal oes, o
Matles oposed of dese ok etee the oes ad usts.
As ou hae leaed, he the plaets foed, thei sufaes ee sujeted to
hea oadet 轟擊  leftoe plaetesials ad fagets.
The ateig ate the as as uh as   ties hat it is at peset.
You ill see lots of ates o these olds – espeiall o Meu ad the Moo.
Notie that ateed sufaes ae old.
Fo eaple, if a laa flo oeed up soe ateed ladsape to ake a e
sufae afte the ed of the hea oadet, fe ates ould e foed
aftead o that sufae.
This is eause ost of the deis 碎片 i the sola sste as goe.
“o, he ou see a sooth plai 平原 o a plaet, ou a guess that the sufae is
ouge tha the ateed aeas.
Oe ipotat a ou a stud a plaet is  folloig the eeg.
The heat i the iteio of a plaet a e left oe fo the foatio of the plaet.
It a also e heat geeated  adioatie dea放射性衰變.
I a ase, it ust flo outad toad the oole sufae hee it is adiated ito
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spae.
I floig outad, the heat a ause pheoea suh as:
Coetie 󱊶流 otios i the atle,
Mageti fields,
Plate otios,
Quakes 震動,
Faults, A ak o eak i the ust
Volais, ad
Moutai uildig.
Heat floig upad though the oole ust akes a lage old like Eath
geologiall atie.
I otast, the Moo ad Meu – oth olds – ooled fast.
“o, the hae little heat floig outad 外表 o ad ae elatiel iatie 無任
何動靜
Atosphees
Whe ou look at Meu ad the Moo, ou a see thei ates, plais, ad
outais.
The sufae of Veus, though, is opletel hidde  a loud atosphee ee
thike tha Eath’s.
Mas, the ediu-sized teestial plaet, has a elatiel thi atosphee.
Eath: Plaet of Etees
Eath is a atie plaet.
It has a olte 熔融 iteio ad heat floig outad to poe olais,
eathuakes, ad a atie ust.
Alost  peet of its sufae is oeed  liuid ate.
The atosphee is N doiated %  ass
It otais a sigifiat aout of oleula 分子 oge alost % O
Eaths Iteio
Fo hat ou ko of the foatio of Eath, ou ould epet it to hae
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