Chapter 5 Our Solar System Survey of Astronomy astro1010-lee.com

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Chapter 5 Our Solar System Survey of Astronomy astro1010-lee.com

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System An Inventory of the Solar System Early astronomers knew: Sun, Moon, Stars, Mercury, Venus, Mars, Jupiter, Saturn, comets, and meteors Now we know: Solar system has one star, eight planets (added Uranus, and Neptune), 135+ moons, asteroids, comets, and meteoroids. Pluto was added as a Planet then reduced to a Dwarf Planet

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Planetary Propertie s Orbital period can be observed Distance from Sun known by Kepler’s laws Radius known from angular size Masses from Kepler’s 3 rd Law as modified by Newton’ Rotation period from observations Density can be calculated knowing radius and mass

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Comparison of the Terrestrial Family of Planets to the Jovian Family of Planets

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Differences between the terrestrial planets Atmospheres and surface conditions are very dissimilar Only Earth has oxygen in atmosphere and liquid water on surface Earth and Mars rotate at about the same rate; Venus and Mercury are much slower, and Venus rotates in the opposite direction Earth and Mars have moons; Mercury and Venus don’t Earth, Mars and Mercury have magnetic fields; Venus does not.

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Interplanetary Debris Asteroids and meteoroids are rocky; asteroids are bigger Asteroid Eros is 34 km long: Comets are icy, with some rocky parts. Comet Hale–Bopp

Chapter 17 Astro1010-lee.com UVU Survey of Astronomy Cloud of gas and dust contracts due to gravity. Conservation of Angular Momentum means it spins faster and faster as it contracts

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Condensation theory : Interstellar dust grains help cool the cloud, and act as condensation nuclei to produce flakes

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System Local temperature in the condensing cloud determines where various materials condense

Early Spacecraft Exploration of the Solar System Soviet Venera probes landed on Venus from 1970–1978 Survey of Astronomy astro1010-lee.com

Early Spacecraft Exploration Pioneer and Voyager flew through the outer solar system. This is Voyager Survey of Astronomy astro1010-lee.com

Survey of Astronomy Astro1010-lee.com Chapter 5 Our Solar System End Chapter 5