Ast101 Lecture - November 20 2012.pdf

2 Pages
Unlock Document

University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

AST101: The Sun and its Neighbors Lecture November 20, 2012 THE SUN - the sun is about the mass of 1047 Jupiters - Solar Dynamics Observatory - the sun is one of the most well-understood things in science - the sun is fairly simple: it's a big sphere - sunspots are on the sun --> the earth is as big as one of these - what is the sun made of? ▯ - mainly Hydrogen --> ionized gas (plasma) ▯ - also Helium - inside, the sun is in hydrostatic balance: pressure from heat generation pushes outward and gravity pulls inward - the core of the sun is where the energy is being produced - also has a radiative zone and convective zone, named after the ways they spread energy - How can we know what's going on inside the sun? ▯ - helioseismology ("sun quakes") - the sun vibrates in many different ways, and the amount of vibrating that it does can tell us what is inside the sun ▯ - neutrinos - "neutrinos, they are very small. They have no charge and have no mass. And do not interact at all. The earth is just a silly ball. To them, through which they simply pass, like dust-maids through a drafty hall or photons through a she
More Less

Related notes for AST101H1

Log In


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


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.