Class Notes (904,972)
CA (538,335)
UTSG (45,721)
AST (668)
AST101H1 (417)
Lecture

Chapter 8

3 Pages
124 Views

Department
Astronomy & Astrophysics
Course Code
AST101H1
Professor
Stefan Mochnacki

This preview shows page 1. Sign up to view the full 3 pages of the document.
Chapter 8: Formation of the Solar System
8.1: The Search for Origins
Four Criteria For Success of Solar System Formation Theory: (1) Must explain
patterns of motions discussed in chap 7. (2) Must explain why planets fall into
terrestrial(small, rocky, near Sun) and jovian(large, hydrogen-rich) categories. (3) Must
explain existence of huge numbers of asteroids + comets + why they reside in asteroid
belt, Kuiper Belt, and Oort Cloud. (4) Must explain gen. pats while allowing exceptions
AKA: Uranus Tilt + Earth’s large moon.
Nebular Hypothesis: Prop’d by Kant + Laplace SS formed from grav collapse of
interstellar cloud of gas.
Other prop was close encounter hypo Sun + other star collided Failed b/c (1)
Couldn’t account 4 orbtial motions of planets or division of planets into two major
categories (2) Collision btw. Sun and star significantly improbable – Stars separated too
far. Chance of encounter so small that would be difficult to imagine happening once to
form SS and doesn’t account for other planetary systems observed.
Nebular hypothesis became Nebular Theory Successfully predicts success of other
planetary objects.
8.2: The Birth of the Solar System
Idea of Solar Nebula: Cloud of gas that collapsed under its own gravity to form our SS.
Gas that made of SN contained apprx 98% H and He + 2% of all other elements.
Three Processes of SN Alteration: (1) Heating: Temp of SN increased as collapsed 
Grav pot energy conv 2 kin energy of indiv gas particles falling inward These partcls
crashed into each other, convs kin energy of inw fall 2 random motions of term energy.
Sun formed in centre where temps + densities highest. (2) Spinning: SN rotated faster
and faster till shrank in radius Rapid rot helped ensure not all materials in SN
collapsed into centre: Greater ang momentum of rot cloud, more spread out will be. (3)
Flattening: SN flattened into disk. Cons o’ collisions btw. particles in spinning cloud.
Diff clumps o’ fas within cloud move in random dircts at random speeds. – clumps
colliede + marge as cloud collapses, + each new clump has avg vel o’ clumps that formed
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Chapter 8: Formation of the Solar System 8.1: The Search for Origins Four Criteria For Success of Solar System Formation Theory: (1) Must explain patterns of motions discussed in chap 7. (2) Must explain why planets fall into terrestrial(small, rocky, near Sun) and jovian(large, hydrogen-rich) categories. (3) Must explain existence of huge numbers of asteroids + comets + why they reside in asteroid belt, Kuiper Belt, and Oort Cloud. (4) Must explain gen. pats while allowing exceptions AKA: Uranus Tilt + Earths large moon. Nebular Hypothesis: Propd by Kant + Laplace SS formed from grav collapse of interstellar cloud of gas. Other prop was close encounter hypo Sun + other star collided Failed bc (1) Couldnt account 4 orbtial motions of planets or division of planets into two major categories (2) Collision btw. Sun and star significantly improbable Stars separated too far. Chance of encounter so small that would be difficult to imagine happening once to form SS and doesnt account for other planetary systems observed. Nebular hypothesis became Neb
More Less
Unlock Document


Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit