Class Notes (839,376)
Canada (511,314)
Astronomy (238)
AS101 (238)
Lecture 14

AS102 Lecture 14

6 Pages
117 Views

Department
Astronomy
Course Code
AS101
Professor
Patrick Mc Graw

This preview shows pages 1 and half of page 2. Sign up to view the full 6 pages of the document.
Description
Lecture 14 4/8/2013 3:49:00 PM Introduction to the Solar System: The Doppler Effect:  When we observe lies from an astronomical source, for example, all the spectral lines of hydrogen, we can compare them with a reference spectrum from hydrogen gas in the lab.  If the source is moving toward us, the spectral lines will be shifted to higher frequencies (blueshift) compared to the reference spectrum.  If the source is moving away from us, the lines will be shifted to lower frequencies (refshift) What are the main objects in the solar system:  The sun o The sun includes most of the matter in the solar system. o Mostly hydrogen and helium  The planets o Terrestrial planets: (Mercury, venus, earth, mars) are small, rocky, and closer to the sun. o Jovian planets (Jupiter, Saturn, Uranus, Neptune) are large, gassy (contain a lot more hydrogen, helium, methane, etc.) and farther from the sun. o Jovian planets also have more moons than the terrestrial planets o Jovian planets all have rings, but saturn’s are the most noticeable. o Order of planets by distance from the sun:  Mercury, venus, mars, Jupiter, satun, Uranus, Neptune.  My very excellent mother just serves us nachos.  Meteoroids, asteroids, comets and dwarf planets. Other parts of the solar system: the asteroid belt:  Asteroid belt is a region at distances approximately 2-4 au from the sun, between the orbits of mars and Jupiter.  Total mass adds up to about 3x10^21 kg, or 4% of the moons mass.  Includes between 7000,000-1,700,000 objects with diameters of 1km or more.  Rocky and metallic, like terrestrial planets, but some also contain water ice.  Actually extremely spread out, not crowded together as in a lot of SF movies.  Largest asteroid: ceres. Other parts of the solar system: the Kuiper Belt:  30-50 au from the sun.  small objects like asteroid belt, but 20-200 times as much mass.  Composed mostly of “ices”: frozen water, methane and ammonia.  Includes pluto and several other dwarf planets Other parts of the solar system: the oort cloud:  2000-50,000 au from the sun (almost 1 ly)  small, icy objects like the Kuiper belt.  Many long-perid comets are believes to come from the oort cloud.  Much less known than other parts of the solar system What about pluto?  Now a dwarf planet.  What is the difference? Some terms:  Planets are large enough (and therefore their gravity is strong enough) to: o Be pulled to a nearly spherical shape b their own gravity. o Clear most other objects out of their orbits.  Dwarf planets: o Large enough to have a spherical shape like planets, but not enough to clear their orbits.  Smaller objects (including most asteroids, comets, meteoroids) have irregular shapes. Notable features of the solar system:  Most of the slar syst
More Less
Unlock Document

Only pages 1 and half of page 2 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

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