What is a galaxy?
Presentation
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English
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11th Grade
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Hard
Татьяна Брыкова
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10 Slides • 0 Questions
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What is a galaxy?
Lesson aims:
1. Find out what a galaxy is
2. Discuss how galaxies are formed
3. Watch and discuss a video about the Milky Way Galaxy
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WARM-UP
What is a galaxy?
What galaxies do you know?
Have you ever visited an observatory?
If not, what would you look at if given the opportunity to look through a telescope? A planet? The moon? A star? A galaxy?
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What is a galaxy?
A massive and gravitationally bound system which is comprised of stars (like the Sun), stellar remnants (compact stars), an interstellar medium of gas and dust, as well as the important, but misunderstood, dark matter - a matter hypothesised to account for gravitational effects that appear to be the result of invisible mass.
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Let's watch how it is formed
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Galaxy Classification
Galaxies are classified by their shapes and how distinct those shapes are:
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Answer the questions
What is a galaxy?
How is it formed?
What are the types of galaxies?
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Why Milky Way?
The Milky Way gets its name from a Greek myth about the goddess Hera who sprayed milk across the sky. In other parts of the world, our galaxy goes by other names. In China it's called the “Silver River,” and in the Kalahari Desert in Southern Africa, it's called the “Backbone of Night.”
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Watch the video and answer the questions
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Answer the questions
How old is our galaxy?
How much does light take to cross from one side to the other?
Why is it tough to see the centre of our galaxy?
What is there in the centre?
What are the three largest galaxies in our local group?
What is a galaxy?
Lesson aims:
1. Find out what a galaxy is
2. Discuss how galaxies are formed
3. Watch and discuss a video about the Milky Way Galaxy
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