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