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Stellar Evolution

Total questions: 46

Worksheet time: 29mins

Name
Class
Date
1.
Most stars are identified as ___________ on an H-R Diagram?
a)
Supergiants
b)
Giants
c)
Main Sequence
d)
White Dwarf
2.

What is the first phase in the life cycle of a star?

a)

molecular gas cloud

b)

protostar

c)

main sequence star

d)

white dwarf

3.

Once a star uses up all of the _________ in its core, the star will expand into a giant or supergiant

a)

light

b)

heat

c)

energy

d)

hydrogen

4.

What determines if a star becomes a giant or a supergiant?

a)

star mass

b)

star temperature

c)

star color

d)

star luminosity

5.

A hypothetical star cluster produces the HR diagram shown. This is known as:

a)

Zero-age main sequence

b)

A globular cluster

c)

An open cluster

d)

The CNO sequence

6.

The image shown is an example of a(n) _____________

a)

Open cluster

b)

Globular cluster

c)

Shockwave

d)

Black hole

7.

The image shown is an example of a(n) _________________

a)

Globular cluster

b)

Open cluster

c)

Time dilation

d)

Planetary nebula

8.

The line in yellow shows the life sequence of a

a)

high mass star

b)

low mass star

c)

neutron star

d)

globular cluster

9.

After a low mass star sheds its outer layers into a planetary nebula, it leaves behind its core, called a

a)

White Dwarf

b)

Neutron Star

c)

Protostar

d)

Zero-age main sequence

10.

When a large enough mass of instellar gas compresses, it begins to heat up and rotate. At this point, a __________ has formed.

a)

giant molecular cloud

b)

protostar

c)

red giant

d)

planetary nebulae

11.
Which type of star has the longest life span?
a)
A star of 10 solar masses
b)
A star of 1 solar mass
c)
A star of 0.1 solar masses
d)
A star of 50 solar masses
12.
The smallest, densest stars in the universe are called...
a)
protostars
b)
white dwarfs
c)
neutron stars
d)
main sequence stars
13.
A star the size of the sun has a life span of...
a)
About 10 Billion Years
b)
About 10 Million Years
c)
About 10 Trillion Years
d)
About 100 Million Years
14.
In which region of the H-R Diagram would you be likely to find the oldest stars?
a)
W
b)
X
c)
Y
d)
Z
15.
In which region of the H-R Diagram would you be likely to find stars fusing hydrogen to make helium in their cores?
a)
W
b)
X
c)
Y
d)
The orange dashed line
16.
Which of these stars is hottest?
a)
Red Star
b)
Yellow Star
c)
Orange Star
d)
Blue Star
17.
Which of these puts the main parts of an average star's life cycle in the correct order?
a)
protostar>
main sequence>
red giant >
white dwarf
b)
protostar> 
main sequence> 
white dwarf> 
red giant
c)
main sequence> 
protostar> 
white dwarf> 
red giant
d)
protostar> 
red giant >
main sequence> 
white dwarf
18.
Which of the following star remnants is the least massive?
a)
White Dwarf
b)
Neuton Star
c)
Black Hole
19.
Which of the following star remnants is the most dense?
a)
White Dwarf
b)
Neutron Star
c)
Black Hole
20.
In which region of the H-R Diagram would you be likely to find Blue Giants?
a)
W
b)
X
c)
Y
d)
Z
21.

Very massive stars continue to fuse elements in their cores all the way up to...

a)

helium (He)

b)

iron (Fe)

c)

carbon (C)

d)

plutonium (Pu)

22.

Which of the following would NOT be useful information for helping to classify stars?

a)

the constellation they are a part of

b)

the mass of the star

c)

the amount of light given off by a star

d)

the color of the star

23.

How do star clusters form?

a)

by collapsing molecular clouds in interstellar space

b)

by a congregation of mass through black holes

c)

through massive shock waves

d)

through worm holes in space/time

24.

All stars in a cluster are about the same age. Why?

a)

the big bang made all stars equal

b)

because they're all made of hydrogen

c)

they formed from the same material in the same region

d)

because they all started out as protostars

25.

"Open" star clusters are groups of ____ of stars that are gravitationally bound.

a)

millions

b)

billions

c)

dozens

d)

hundreds of thousands

26.

The Pleiades - also known as the "Seven Sisters" are a good example of a nearby

a)

stellar association.

b)

open cluster.

c)

emission nebula.

d)

group of stars.

27.

How do astronomers know that globular clusters are some of the oldest objects in the Universe?

a)

because astronomers can predict stellar evolution

b)

there are no young O, B, A & F stars present in the clusters

c)

because globular clusters orbit every large galaxy

d)

globular clusters are very rare since only 150 exist

28.

What the last element to be produced before a low-mass star collapses?

a)

Helium

b)

Oxygen

c)

Silicon

d)

Iron

29.

What the last element to be produced before a high-mass star collapses?

a)

Helium

b)

Oxygen

c)

Silicon

d)

Iron

30.

What event causes heavier elements to scatter across the universe?

a)

Nuclear Fusion

b)

Supernova

c)

Nucleosynthesis

d)

Convection

31.

What will the sun, a low-mass star, ultimately form?

a)

A black hole

b)

A neutron star

c)

A white dwarf

d)

A supernova

32.
Our sun is currently in what star stage?
a)
Protostar
b)
Nebula
c)
Main Sequence
d)
Red Giant
33.
After the main sequence, a low mass star becomes a
a)
black dwarf
b)
protostar
c)
red giant
d)
supergiant
34.

After the main sequence, a high mass star becomes a

a)

black dwarf

b)

protostar

c)

red giant

d)

supergiant

35.
After a supergiant, a high mass star explodes and forms a
a)
supernova
b)
red giant
c)
black hole
d)
planetary nebula
36.
When a nebula heats up, a "baby" star forms in the middle. It is called a
a)
supernova
b)
supergiant
c)
white dwarf
d)
protostar
37.
Stars that are closer appear to move more than distant stars due to the phenomenon called... 
a)
periphelion
b)
parallel
c)
prism
d)
parallax
38.

This HR Diagram overlays data from many star clusters. According to this diagram, which cluster is oldest?

a)

M67

b)

The Pleiades

c)

NGC 2362

d)

The Hyades

39.

This HR Diagram overlays data from many star clusters. According to this diagram, which cluster is youngest?

a)

M67

b)

The Pleiades

c)

NGC 2362

d)

The Hyades

40.

In which region of the H-R Diagram would you be likely to find the youngest stars?

a)

W

b)

X

c)

Y

d)

Z

41.

Astronomers can age star clusters by

a)

Examining an HR Diagram for the stars in the cluster to see where the stars depart the main sequence

b)

Examining an HR Diagram for the stars in the cluster to count how many white dwarf stars are present

c)

Examing the spectra of any star in the cluster

d)

Examining the space around the cluster

42.

A very old star cluster is expected to

a)

Have many blue stars

b)

Have an even distribution of stars

c)

Have a lack of blue stars

d)

Be extremely large

43.

Some very old globular clusters have a handful of blue stars known as Blue Stragglers. These are probably present because

a)

Old clusters tend to have more blue stars than red stars

b)

Globular clusters are dense, and colliding stars sometimes combine and make new, young, hotter stars

c)

Globular clusters are sparse, and there is nothing to disrupt the evolution of a blue star

d)

Blue stars are short lived, and will have already died out

44.

The image depicts the life route of a

a)

Low mass star

b)

High mass star

c)

Blue star

d)

White Dwarf

45.

After a low-mass Red Giant loses its ability to fuse elements, it will shed it's outer layers and become a

a)

Low mass star

b)

High mass star

c)

Blue star

d)

White Dwarf

46.

Low mass red giant stars participate in a fusion chain resulting in which products?

a)

Carbon, Nitrogen, Oxygen

b)

Helium, Carbon, Beryllium

c)

Oxygen, Neon, Iron

d)

Hydrogen, Helium, Carbon

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