Chapter 1 Study Guide.docx - Chapter 1 Study Guide 1...

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Chapter 1 Study Guide 1. Geocentric means the Earth is at the center of the universe whereas heliocentric has the Sun at the center 2. The ecliptic is the plane that all the planets orbit the sun on, pluto isn’t a planet because it cant clear its orbit of other objects 3. The volume of the universe is constantly expanding and the farther out the faster it is 4. Big Bang happened 13.8 billion years, was a small point that exploded 5. Gravity pulled nebulae of hydrogen and helium gas together, more and more gas got pulled in and turned into a plate like shape called an accretionary disk. Gravity pulled the center into a ball then it got really hot and became a protostar. Nebular Theory is the model for explaining the sequence of stages during which starts and planets form from a nebula 6. Melting and Planetary Differentiation, denser materials go into middle 7. Moon formed when a protoplanet hit Earth, the debris stayed in orbit then formed into the moon 8. Gravity pulls it in 9.
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