Lesson Notes By Weeks and Term v4 - SHS 3

Lesson Video

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Performance objectives

• Define and distinguish between comets, asteroids, meteors, and meteorites.
• Explain the characteristics and movement of comets and asteroids.
• Describe how these celestial objects have influenced Ghanaian culture and society.
• Analyze the impact of extra-solar objects on our environment and economy.

Lesson summary

This lesson explores the fascinating objects we see in our night sky. We will move beyond our planet to understand comets, asteroids, meteors, and the star patterns we call constellations. For generations, people in Ghana and across Africa have looked to the skies for guidance, inspiration, and to tell stories. This lesson will not only explain the science behind these celestial objects but also connect them to our own culture, history, and modern society. Understanding these objects helps us appreciate our place in the universe and the scientific principles that govern it.

Lesson notes

This section breaks down the essential scientific concepts. We will explore what these objects are and how they differ from one another. A. Comets: The "Dirty Snowballs" of Space

A comet is a celestial body made primarily of ice, dust, and frozen gases (like methane, ammonia, and carbon dioxide). They are often described as "dirty snowballs." Origin: Most comets come from the cold, outer reaches of our solar system, in regions called the Kuiper Belt and the Oort Cloud. Orbit: Comets have highly elliptical (oval-shaped) orbits around the Sun. This means they spend most of their time very far away from the Sun, but then swing in very close before heading back out. Appearance: When a comet gets close to the Sun, the Sun's heat causes the ice to sublimate (turn directly from solid to gas). This process releases gas and dust, forming a glowing head called a coma and two distinct tails: Ion (Gas) Tail: Made of charged gas particles. It is pushed directly away from the Sun by the solar wind, so it always points away from the Sun. It often glows blue. Dust Tail: Made of tiny solid particles. It is less affected by the solar wind and tends to follow the comet's orbital path. It reflects sunlight and appears whitish-yellow.

Diagrammatic Representation: ```

\ (Direction of Motion) --> ``` B. Asteroids: The Rocky Neighbours

Evaluation guide

• Explain how extra solar objects such as Comets, Asteroids and Constellations affect
• our culture and socie ty.
• Enquiry Learning: Using videos and pictures, describe and distinguish between comets,
• asteroids, meteors, meteorites