EARTH 119 Chapter Notes - Chapter 1: Stellar Nucleosynthesis, Terrestrial Planet, Protoplanetary Disk

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Earth 119- chapter 1: cosmology and the birth of earth. Universe: all of space and all the matter and energy within it. Cosmology: the systematic study of the overall structure and history of the universe. Geocentric model: the model of the universe in which the earth sits without moving at the center of the universe, while the moon and the planets orbit around it within a globe of stars. Heliocentric model: the model of the universe in which the sun lay at the center of the. Universe, with the earth and the other planets orbiting around it. Gravity: the attractive force that one object exerts on another. Solar system: the sun, planets, moons, and countless other small objects held together by gravitational attraction. Planet: an object that orbits a star, is spherical, and has cleared its neighborhood of other objects . Moon: a sizeable body locked in orbit around a planet.

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