Tell us the masses of
Half of all stars are multiple
1) Period of revolution
2) semi-major axis of
=> mass sum
3) rA & rB give mass ratio
Luminosity of main sequence stars increases dramati
Awesome picture of Jupiter and moons
by Jasmine Ma
First extrasolar planet discovered around pulsar in 1992, PSR 1257+12
First exoplanet discovered around normal star 1995 (51 Pegasi)
Astronomers just scratching the surface
Likely billions of e
Last Class: Nov. 27, all homework due
Final exam: Thursday, Dec. 19, 4:00 pm, PAC 2-3
Exam Review: Next class, Nov. 27
Format: open. Bring questions with you.
I will remain in class until all questions are exhausted
I will be available until the final exa
The Andromeda Galaxy
2.5 million Ly away
7 x 1011 solar masses
~size of Milky Way
can see with eye!
Three Primary Types
Spiral - like the Milky Way
Composition: Young & old stars, dust, cold gas
Dark Matter Halo
Light & Energy
How do light and radio waves dier?
Is light a wave or a par9cle?
What are the proper9es of light?
How do telescopes work?
How is electromagnetic radiation created?
Visual light, infrared radia9o