AS101 Lecture 17

AS101 Lecture 17 - AS101 Lecture 17 Logistics: Do the night...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
AS101 Lecture 17 Logistics: • Do the night lab as soon as you can • Last Day to WITHDRW is Nov 5. Last Lecture: • Overview of the solar system • Solar System formation Today’s Lecture: • Solar System formation • Dating the solar system • Geology of Terrestrial Planets
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Midterm 1 Results 0 2 4 6 8 10 12 14 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 Frequency Score Midterm Exam 1 Mean 70.12 Median 73.75 Mode 76.00 Minimum 29.00 Maximum 94.00
Background image of page 2
Review: How to Build Planets Gravitational collapse makes protostar and nebula Small bodies Condense to form planetesimals •Metals and Rocks near the sun •Ices beyond the frostline Accretion: • Everywhere: Small bodies combine to make larger ones • Beyond the frostline: Larger bodies collects H and He to form gas giants Moon Formation: Each gas (Jovian) planet formed its own “miniature” solar nebula. Moons formed out of the disk.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What happened to the leftover planetesimals? • Some became asteroids - rocky - those that were inside the frost line Jupiter’s gravity keeps them in a circular belt - frequent collisions produce meteorites • Some became comets - those that were formed within Neptune’s orbit suffered frequent collisions - small in size (Kuiper belt) Those beyond Neptune’s orbit could continue their accretion - Pluto may be one of these Those that escaped being gobbled up by Jovian planets and satellites were flung off in random directions - Oort cloud
Background image of page 4
Gravity makes large bodies spherical Combined mass of all asteroids is 1/1,000 of Earth’s mass
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Origin of the Comets Leftover icy planetesimals: comets . Formed between the Jovian planets, either captured, or gravitationally flung in all directions into the Oort cloud . Those formed beyond Neptune’s orbit remained in the ecliptic plane: Kuiper belt . The nebular theory predicted the existence of the Kuiper belt 40 years before it was discovered!
Background image of page 6
Problem with the nebular theory • The center of the nebula (the Sun) should be rotating much faster than it is observed – the angular momentum problem (the cloud that formed our solar system is called the solar nebula ) • How does one explain the retrograde rotation?
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The solar system “angular momentum problem” • The total angular momentum of the solar system includes the sum total of the rotational and orbital angular momentum of all planets, asteroids and comets
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 32

AS101 Lecture 17 - AS101 Lecture 17 Logistics: Do the night...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online