ISP 205 - Astronomy Gary D. Westfall1Lecture 10 The Moon The Moon has 1/80 the mass of the Earth and 1/6 its gravity The Moon has no atmosphere because.
ISP 205 - Astronomy Gary D. Westfall1Lecture 19 The Interstellar Medium About 99% of the material between the stars is in the form of a gas The remaining.
ISP 205 - Astronomy Gary D. Westfall1Lecture 18 The H-R Diagram In 1913, the American astronomer Henry Russel plotted the luminosities of stars versus.
ISP 205 - Astronomy Gary D. Westfall1Lecture 1 The Universe on a Large Scale The nearest galaxy to the Milky Way is 75,000 light years away (controversial)
ISP 205 - Astronomy Gary D. Westfall1Lecture 20 The Lifetime of Stars Once a star has reached the main sequence stage of it life, it derives its energy.
ISP 205 - Astronomy Gary D. Westfall1Lecture 4 Review of Gravity The force that hold the planets in orbit is gravity Gravity is a property of mass The.
