AST201 Lecture 6Thursday.docx

2 Pages
Unlock Document

Astronomy & Astrophysics
Michael Reid

AST201 Lecture 6 Thursday, January 23, 2014 -a supernova is an explosion of a star, which tears it apart in seconds -end of life for the star -sometimes when a star is very close the supernova can be seen during the day -hasn’t happened in our lifetime -in order to locate a black hole we look for objects orbiting something that cannot be seen -first conclusive bit of evidence for the existence of black holes came from people at UofT -were studying stars in the constellation Cygnus -noticed objects were orbiting something that wasn’t there -by working out the orbit of the star they were able to work out the mass of the invisible object -was devouring Cygnus X-1 -the X-rays we see coming from Cygnus X-1 is hot material just outside the event horizon -not coming from the black hole itself, black holes emit nothing since nothing escapes them -has a mass 15 times greater than the Sun and i
More Less

Related notes for AST201H1

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.