AST101- Oct 27, 2011.docx

2 Pages
Unlock Document

Astronomy & Astrophysics
Michael Reid

AST101 Comparative planetology Active vs inactive geology Active: earth, venus  very similar in composition, size and shape (only surfaces different) Inactive: mars, mercury, moon  none similar  Main difference between active and inactive geology: their size (they are larger) Heat: 3 ways in, 3 ways out Accretion: smash stuff into it - Mainly happened in the early solar system - Transfer thermal energy to heat - Heat goes mainly in the crust Differentiation: making those heavy stuff sink into the interior, giving up potential gravitational energy in the form of heat - Heavy stuff sinks to middle, lighter stuff rises to surface - Mainly happened when planets were young Radioactivity: radioactive atoms decay and produce energy - Can continue for billions of years - When first comes together (the planet) it binds all elements together and many of them are radioactive because they came from supernova; once all the elements are incorporated into a planet they sit there and decay and release their energy at different rates and times - Takes longer for planet to decay if larger 3 ways to cool a planet - Convection: heat is carried by hot material moving to a cooler area, eg. boiling o Eg. hot water at bottom of pot and starts to expand where the cold sinks to the bottom and then get heated itself - Conduction: heat
More Less

Related notes for AST101H1

Log In


Join OneClass

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

Sign up

Join to view


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.