The Earth-Moon-Sun System

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Presentation transcript:

The Earth-Moon-Sun System

Rotation vs. Revolution Rotation – the spinning of a body on its axis Revolution – the motion of a body along a path around some point in space

Precession The slight movement of Earth’s axis over a period of 26,000 years

Seasons Caused because Earth’s axis is tilted 23.5 degrees Summer – N. Hemisphere is farthest from sun Winter – N. Hemisphere is closest to sun

The moon does not make it’s own light. It reflects sunlight. Moon Shine The moon does not make it’s own light. It reflects sunlight.

Waxing & Waning Waxing – Light side gets larger Waning – Light side gets smaller New Moon First Quarter Full Moon Third Quarter New Moon Animation

Eclipses Lunar: The shadow from Earth blocks the light from the sun. Lunar = Moon goes dark. Solar: The shadow from the Moon blocks the light from the sun. Solar = Sun goes dark.

Umbra & Penumbra The Moon & Earth cast 2 shadows. The darkest is the Umbra. The lighter is the Penumbra.

The Origin of the Moon It is widely believed that the moon was formed when a Mars sized object smashed into the early Earth.

The Lunar Surface Craters – round depressions in the surface of the moon – most were produced by the impact of rapidly moving debris

Highlands – densely pitted, light-colored areas that cover most of the lunar surface

Maria – dark, smooth surfaces – originated when asteroids punctured the lunar surface, letting magma bleed out

Lunar Regolith – a soil-like layer of gray debris covering the surface of the moon – made up of rocks, glass beads, and fine lunar dust