Earth’s Origin & Motion

CORNELL SET-UP Title: EARTH’S ORIGIN & MOTION BIG IDEAS: (Leave Space for Notes) NEBULAR HYPOTHESIS HIERARCHY OF ORGANIZATION KEPLER’S LAWS OF PLANETARY MOTION SUMMARY (3-4 Complete Sentences)

Formation of the Earth’s Solar System Nebular Hypothesis (READ - Do Not Write) Our solar system began as a cloud of dust and gases( Helium and Hydrogen) with heavier elements in the center. The cloud (called a nebula) began to spin and collapse toward the center where heat was generated and formed the sun. Cooling formed large particles which where thrown out and formed planets. Heavier particles formed the inner planets – Mercury, Venus, Earth & Mars Lighter particles formed the outer planets – Jupiter, Saturn, Uranus & Neptune

Summary Nebular Hypothesis Solar Nebula made of Hydrogen & Helium gas Rotating – Collapsed toward the center Heating in the center created the sun Cooling – Rocks formed (particles) – Planets Inner Planets: Mercury, Venus, Earth, Mars Outer Planets: Jupiter, Saturn, Uranus & Neptune

Hierarchy of Organization Hierarchy: Arrangement of items above and below The universe is made up of galaxies which are made up of many stars. Some stars have planetary systems similar to our solar system. Earth is a satellite planet of one particular star (our sun) . (Draw!) Universe Galaxy Starts (Sun) Planetary System Earth

Kelper’s 3 Laws of Plantery Motion Go to the following website and add the following to your notes. List Keper’s Three Laws (Click the boxes) For each law give a brief description. Explore the website until time is called http://howthingsfly.si.edu/flight-dynamics/kepler%E2%80%99s-laws-orbital-motion Link is also located on the wiki beside ppt link.

Kepler’s Law of Planetary Motion Kepler’s Law is 3 scientific laws explaining orbital motion. Kepler's laws are: The Law of Orbit: The orbit of every planet is an ellipse with the Sun at one of the two foci. The Law of Area: A line joining a planet and the Sun sweeps out equal areas during equal intervals of time. The Law of Period: The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. Video: http://www.youtube.com/watch?v=5a2mcE-tzKE

To understand axial tilt, we employ the right hand rule To understand axial tilt, we employ the right hand rule. When the fingers of the right hand are curled around in the direction of the planet's rotation, the thumb points in the direction of the north pole.