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Earth’s Moon Chapter 1, Section 4, p30-33. Earth’s Moon Telescope: device built to observe distant objects by making them appear closer – Galileo created.

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Presentation on theme: "Earth’s Moon Chapter 1, Section 4, p30-33. Earth’s Moon Telescope: device built to observe distant objects by making them appear closer – Galileo created."— Presentation transcript:

1 Earth’s Moon Chapter 1, Section 4, p30-33

2 Earth’s Moon Telescope: device built to observe distant objects by making them appear closer – Galileo created his own telescope 2 lenses placed in wooden tube Lenses focused light – Galileo pointed his telescope at the moon Saw surface in more detail than anyone before him Irregular surface with remarkable features – Previously believed to be smooth

3 Earth’s Moon Links on Earth’s moon: – (scn-0614)

4 The Moon’s Surface Features on the moon’s surface include maria, craters, and highlands Maria – Maria: dark, flat areas Latin for “seas” Galileo believed maria were oceans Hardened rock from ancient lava flows 3-4 b.y.a. Highlands – Galileo inferred light colored features were highlands / mountains Galileo could see shadows cast by rugged highlands

5 The Moon’s Surface Features on the moon’s surface include maria, craters, and highlands Craters – Craters: large, round pits Scientists once thought craters formed by volcanoes Created by meteoroid impacts – Meteoroids: chunks of rock or dust from space – Maria has fewer craters than surrounding areas Most impacts formed early in moon’s history before maria formed – Earth has fewer craters than moon Worn away over time by wind, water, and other forces Moon’s surface has changed little – Lacks wind, water, and other forces

6 Characteristics of the Moon Earth’s closest neighbor – very different characteristics – The moon is dry and airless – Compared to Earth, the moon is small and has large variations in its surface temperature wear bulky space suit to breathe, protect against sunburns, and keep temperature comfortable

7 Characteristics of the Moon Size and Density – ¼ Earth’s diameter – 1 / 80 Earth’s mass – Moon’s density similar to Earth’s outer layers Earth has very dense core

8 Characteristics of the Moon Temperature & Atmosphere – Range: 130°C to -180°C – Extreme temperatures caused by no atmosphere Weak surface gravity allows atmospheric gases to escape into space

9 Characteristics of the Moon Water – No liquid water – Evidence of large patch of ice near moon’s poles Areas shielded by crater walls Valuable for future colonies as transporting water would be expensive

10 The Origin of the Moon Where did the moon come from? – Rejected ideas: Was it formed elsewhere and captured by Earth’s gravity Was it formed near Earth at the same time Earth formed?

11 The Origin of the Moon Where did the moon come from? – Collision-ring theory Scientists theorize that a planet-sized object collided with Earth to form the moon Material from this object and Earth’s outer layer was ejected into orbit Ejected material formed a ring Gravity caused material to combine to form moon

12 Homework Read Chapter 1, Section 4; p30-33 Answer ?s 1-3 p33


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