1.Star:  Ball of gases that gives off a tremendous amount of electromagnetic energy created by nuclear fusion within the star 2. Analyzing Starlight: a) The composition/temperature…

1.The SunSolar Composition • The Sun consists of hydrogen, about 73.4 percent by mass, and helium, 25 percent, as well as a small amount of other elements. • This composition…

Slide 1 Hour 2: Stars, Stellar Evolution, and Creation of Chemical Elements The Sun & Nuclear Fusion - Energy for Life The Sun Compared With Other Stars Stellar Evolution…

Slide 1 1 Class events: week 11 Goals Learn about stars—a primer from basic astronomy Luminosity (and brightness) Distance Temperature Hertzprung-Russell diagram Radii…

Slide 1 Copyright © 2010 Pearson Education, Inc. Chapter 14 The Milky Way Galaxy Slide 2 Copyright © 2010 Pearson Education, Inc. Chapter 14 The Milky Way Galaxy Slide…

Slide 1 Gravitational Lenses The First Discoveries Slide 2 Summary: - first detections of gravitational deflection of light - some early theoretical developments - discovery…

Slide 1 Binary Stars Astronomy 315 Professor Lee Carkner Lecture 9 Slide 2 Masses of Stars  While we can find the radius of a star from the Stefan-Boltzmann Law, we still…

Slide 1 Properties of Main Sequence Stars Masses Luminosities Lifetimes Distribution Slide 2 How do we know the masses of stars? By studying binary stars! “The mass of…

Slide 1 Slide 1 Slide 2 Slide 2 How to classify a star and to place it on the H-R diagram correctly?? Need to know its luminosity, but it is difficult, because distance is…

Slide 1 Announcements Wednesday night star parties begin this week, 8:45 pm, weather permitting. Attend one for 4 points extra credit! (Staff signature required.) 10:00 office…