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Transcript of Prepare your scantron: Fill in your name and fill the bubbles under your name. LAST NAME FIRST,...
Prepare your scantron:• Fill in your name and fill the bubbles under your name.• LAST NAME FIRST, First name second• Put your 4-digit code instead of “IDENTIFICATION NUMBER”. --- (The last 4 digits of your OleMiss ID.)
Question # 1: answer A Question # 2: answer AQuestion # 3: answer E
Setup:
Please take a moment to mute your cell phone!Please take a moment to mute your cell phone!
Usea pencil,
not a pen!
Exercises: recognizedeep-sky objects
You’ll need to answer: which of these five typesof deep-sky objects we are looking at and
how we know and what it is:
1. open cluster2. globular cluster
3. galaxy4. planetary nebula5. diffuse nebula:
reflection nebula, HII region, dust cloud, or a combination
What is it?How do we know?
What object?
Exercise 1
Supernova remnant
Looks like result of explosionA star blew up
What is it?How do we know?
What object?Globular cluster
Many stars in sphere shapeCluster of > 100,000 stars inside
the Galaxy
What is it?
How do we know?
What object?Diffuse nebula (HII zone)
Glowing gas illuminated by blue stars
Hot interstellar hydrogen gas cloud surrounds young hot stars
What is it?How do we know?
What object?
Exercise 2
Planetary nebula
One star in the middle of colorful gasOld star loosing its atmosphere to space
What is it?How do we know?
What object?Open cluster
Many scattered starsLoose disintegrating cluster
of ~ 1,000 young starsinside the Galaxy
What is it?How do we know?
What object?Galaxy
Lens-shaped star system with dark lane Star system of 100 billion stars like
the Milky Way Galaxy
What is it?How do we know?
What object?
Exercise 3Open cluster
Many scattered starsLoose disintegrating cluster of ~ 1,000
young stars inside the Galaxy
What is it?How do we know?
What object?Diffuse nebula: HII region + dust clouds
Glowing gas, dark dust clouds in frontHot interstellar hydrogen with dust blocking some of the light. A star formation region.
What is it?How do we know?What object?Open cluster with reflection nebula
Blue cloud around bright stars Loose disintegrating cluster of ~ 1,000 young stars inside the Galaxy, light reflected on interstellar dust.
How do we know
Exercise 4
What is it?
How do we know?
What object?Supernova remnant
Looks like result of explosion
Star blew up
What is it?
Lens-shaped star system withspiral arms
What object?Galaxy
Star system of 100 billion starslike the Milky Way Galaxy
What is it?
How do we know?
What object?
Exercise 5Planetary nebula behind open cluster
Many scattered stars + One star in the middle of colorful gas
Loose disintegrating cluster of ~ 1,000 young stars inside the Galaxy + Old star loosing its atmosphere to space (unrelated)
Insert:
Questions coming …
sec
30Question 4 29What is on the picture?
A A star cluster
B A galaxy
C A supernova
remnant
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Next question coming …
sec
30Question 5 29What is on the picture?
A An open cluster
B A globular cluster
C A galaxy
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Next question coming …
sec
30Question 6 29What is in the picture?
A A star cluster
B A galaxy
C A supernovaremnant
D A planetary nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Next question coming …
sec
30Question 7 29What is on the picture?
A An open cluster
B A galaxy
C A globular cluster
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Next question coming …
sec
30Question 8 29What is on the picture?
A An open cluster
B A globular cluster
C A galaxy
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Next question coming …
sec
30Question 9 29What is on the picture?
A An open cluster
B A globular cluster
C A galaxy
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
sec
30Question 10 29What is on the picture?
A An open cluster
B A globular cluster
C A galaxy
D A planetary
nebula
E A diffuse nebula
28272625242322212019181716151413121110 9 8 7 6 5 4 3 2 1 0
Memorize this, please!Memorize this, please!
The hierarchy of the Universe, Step 1
Earth Moon
Size: 3476 km
Distance: 384,400 km
Step 1:The hierarchy of the Universe
Size : 12,756 km = 7972 miles
The hierarchy of the Universe, Step 2TheSunis a
STAR
Earth
Distance = 400,000 km
Step 2: the Solar System
PlanetsThe planets revolve around the Sun
and reflect sunlight(they are not in a bunch as in this picture)
Distance = 150 million km= 1 AU
(Astronomical Unit)
Memorize this, please!Memorize this, please!
The hierarchy of the Universe, Step 3
Sun
Star
Step 3: Stars
Star
Each star may come with its own planets(we cannot see these planets directly: too small and far away)
Distance = a few light years1 light year = 10,000 billion km (= 1013 km)
Star
Star
Star
The closest star (except the Sun): Proxima Centauri - 4 light years