Page 19 - Geography for Secondary Schools Student’s Book Form One

Geography for Secondary Schools
Student’s Book Form One

astrophysicists believe that meteorites and According to the origin of the universe,
asteroids were formed from disintegration the solar system is found in one arm of

of planet. the Milky Way galaxy in the universe. The
Thus, so they reject the idea that the planets Milky Way is a galaxy with a spiral arm
were formed out of meteorites and asteroids. structure and a central bar-shaped region
composed of stars, gas, dust, and dark
FOR ONLINE READING ONLY
Activity 2.2 matter. The name “Milky Way” arises
from its appearance as a hazy band of light
Search for information on the creation stretching across the night sky. This band
theory from the library or other reliable is composed of countless distant stars and
online sources. Then, prepare points other celestial objects. This band is most
to either oppose or propose the theory visible from the Earth in areas with minimal
in relation to other theories you have light pollution. It is the galaxy that contains
studied. our solar system, where the Earth is found.

Exercise 2.1 The Milky Way contains billions of stars.
A galaxy is a vast and immense system
1. How do you relate the sun, moon, of stars, stellar remnants, interstellar gas,
stars, and other objects you see in the dust, and dark matter bound together by
sky with the origin of the Earth? gravity. These components are held in a
2. Using the theories that you have specific, organised structure that can take
identified regarding the earth’s origin, various forms, including spiral, elliptical,
complete the provided matrix. or irregular shapes. Galaxies come in a
wide range of sizes, with some containing
Name of Key Critique just a few million stars, while others, like
the theory assumptions the Milky Way, host hundreds of billions

of stars. Additionally, galaxies can exist
in isolation or be part of larger groups or
3. Do you think that knowledge about clusters of galaxies.
the earth’s origins has significance in The universe is teeming with galaxies and
your everyday life? Provide reasons they are the basic building blocks of the
to support your answer. cosmic structure. They serve as focal points
for astronomical study and are integral to
our understanding of the larger cosmos.
Position of the Earth in the Solar system Each galaxy, in turn, can be home to its
own planetary systems, which may include
Activity 2.3 planets, moons, asteroids, and comets. The
Milky Way is just one of billions of galaxies
Utilise materials readily available in your in the universe. It plays a fundamental role
local area to design a model illustrating in our understanding of the cosmos and it
the solar system, displaying all the planets is a subject of extensive study in the fields
and their orbital paths. of astronomy and astrophysics.

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