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2.1 The Solar System Big Idea: The position of Earth in the solar system, rotation, and revolution affects weather and Human activities.

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Presentation on theme: "2.1 The Solar System Big Idea: The position of Earth in the solar system, rotation, and revolution affects weather and Human activities."— Presentation transcript:

1 2.1 The Solar System Big Idea: The position of Earth in the solar system, rotation, and revolution affects weather and Human activities.

2 Section 1 Discussion Questions What is the Earth’s position in the solar system? How do rotation and revolution affect the Earth?

3 Section 1 The Solar System I.Space and earth = universe I.Stars=galaxies= The Milky Way (us) A. Planets 1. Solar System - sun & group of bodies that revolve around it (planets, dwarf planets, small solar system bodies like asteroids and comets.) 2. 8 planets- Pluto considered dwarf planet in 2006 (International Astronomical Union) has a small rocky core. 3. Earth and other planets are shaped like a oblate spheroid -flattened at poles and bulging at equator 4. Moons are natural satellites that orbit planets

4 B. The Sun, Earth and Moon 1. Diameter of Earth is 8,000 miles * 3 rd from sun and 5 th largest * Has an elliptical (oval Shaped Orbit ) 2. Diameter of Sun is 865,000 miles (Bigger than Earth) 3. Moon orbits Earth every 29.5 days and is ¼ the size of earth. 4. All exert gravitational forces on each other which affect physical processes on Earth like tides.

5 Tides geography Asteriod photo is the WWII bombing of Japan and comparable to an asteriod

6 Earth’s Rotation, Revolution and Tilt II.A. Solar Energy-energy from sun in form of heat and light. It impacts life in many ways. B. Rotation 1. Earth spins on axis- allows equal heat and cooling 2. One complete spin is called rotation (24 hours) 3. Rotates from west to east - sun rises in the east and sets in the west

7 C. Revolution- Earths elliptical orbit 1. Earth makes one trip around the sun in 365 ¼ days in an ellipse. 2. Feb. 29 th is added every 4 years to make that year 366 (leap year)

8 D. Tilt 1. Tilted at 23 ½ degrees as it orbits 2. The tilt affects the amount of solar energy hitting the earth Reading Check: How do rotation, revolution and tilt affect the amount of solar energy received at different locations on the Earth?


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