ASTR 101 Chapter 7-9, 11: Chapter 7 (7.1-7.3), Chapter 8 (8.1-8.3), Chapter 9 (9.1-9.3), Chapter 11
Document Summary
Chapter 7 (7. 1-7. 3), chapter 8 (8. 1-8. 3), chapter 9 (9. 1-9. 3), chapter 11. The sun is brighter than 80% of the stars in the milky way. Surface layer of incandescent gas and internal temperature of millions of degrees. Masses are measured using kepler"s laws of planetary motion and newton"s law of gravitation. Today, we measure more accurate numbers by tracking their gravitational pull on spacecrafts passing by them. Smaller worlds beyond neptune are known as trans-neptunian objects (tnos) The largest tnos are classified as dwarf planets (pluto, eris, haumea and. Ceres (in the asteroid belt) is also classified as a dwarf planet. To date, more than 1,750 have been discovered. Venus rotates in the opposite direction of its revolution about the sun. Uranus and pluto rotates on axes nearly tipped on their side. These are exception to the normal rotation of planets. Mercury, venus, earth and mars are called the terrestrial planets. The moon is also classified as a terrestrial object.
