do now question what is an example of each type of galaxy? spiral- elliptical - irregular milky way...
TRANSCRIPT
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DO NOW QUESTION
What is an example of each type of galaxy?
Spiral - Elliptical - Irregular• Milky Way
• Andromeda• M87 • Large
Magnellanic Cloud
Add examples to your Princeton Notes!
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Elliptical
Irregular
Spiral
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Galaxy
Large groups of stars, dust, and gas
Come in a variety of sizes and shapes
Can have more than a trillion stars
Can estimate how many sun-sized stars the galaxy may have by studying the size and brightness of the galaxy
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Spiral Galaxy
Bulge at the center and spiral arms
Spiral arms are made up of gas, dust, and new stars
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Milky Way Galaxy
Spiral Galaxy
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5. What is an elliptical galaxy?
1/3 of all galaxies
Described as a “massive blob” of stars
Generally looks like a sphere
Has a very bright center
Very little gas and dust
Contains mostly old stars
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6. What is an irregular galaxy?
Irregular shaped galaxy
“cloud-like”
ADD TO NOTES:
¼ of all galaxies
Contains large amount of gas and dust
A lot of star formation occurs within
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10. What are quasars?
Among the most distant objects in space
“Star-like” sources of light
Among the most powerful energy sources in the Universe
May be caused by massive black holes in the cores of distant galaxies
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Quasars
Fun Fact: Because they are so far away, they are found using radio waves
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Nebula Large clouds of gas and dust
Some glow
Some absorb light and hide stars
Some reflect starlight
Some are regions where new stars form
Spiral galaxies usually contain nebulas
Elliptical galaxies contain very few nebulas
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EX: Crab Nebula
In the Taurus constellation
Not visible to unaided eyeAt center is the Crab pulsar
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Globular Cluster Groups of older stars
Looks like a ball
Up to 1 million stars
Located in a spherical halo that surround spiral galaxies
Also commonly located near giant elliptical galaxies
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EX: Omega Centauri Cluster
Located in Centaurus constellation
Largest and brightest globular cluster in Milky Way Galaxy
10,000,000 stars10 - 12 billion years old
11 Visible to unaided eye
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Open Clusters
Groups of closely grouped stars
Usually located along the spiral disk of a galaxy
Newly formed open clusters have many bright blue stars
Few hundred to a few thousand stars
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EX: The Wild Duck Cluster (M11)
Located in Scutum constellation