Ast101 Lecture - November 27 .pdf

2 Pages
Unlock Document

University of Toronto St. George
Astronomy & Astrophysics
Michael Reid

Ast101 Lecture November 27, 2012 - the solar thermostat stabilizes energy production in the core - nuclear fusion occurs in the sun's core --> uses hydrogen to create helium - the physical conditions inside the sun work like a natural thermostat - a slight drop in core temperature makes the particles in the core slow down - this leads to a large decrease in fusion, because for fusion to occur the particles must be moving very fast - this in turn lowers the core pressure, causing the core to contract and heat up, and restore the fusion rate to normal - this process also works in reverse, if the sun's core gets a little hotter - KNOW HOW TO DO THIS ON THE EXAM Extrasolar Planets - we have discovered hundreds of extrasolar planets, and have candidate planets for thousands - we believe there to be trillions - extrasolar planets, or exoplanets, are planets orbiting a star other than the sun - rogue planet: a planet which isn't orbiting a star - exoplanets are very hard to image directly - we deduce the presence of exoplanets indirectly. We haven't actually seen most of them -planets are mostly producing infrared light - 200-300 K - stars typically emit visible light 3000-10000 K - at the infrared wavelength, therefore, a planet will appear brightest relative to its parent star - the probl
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.