WorksheetsReview of Star Notes
Total questions: 63
Worksheet time: 32mins
What is a clue to the temperature of a star?
The size of the star
The color of the star
The distance of the star from Earth
The shape of the star
What color do very hot stars (30,000K) appear?
Red
Yellow
Blue
White
What type of energy do red stars emit?
Short wave energy
Long wave energy
Medium wave energy
No energy
What is the temperature range of yellow stars?
3000 to 4000 K
4000 to 5000 K
5000 to 6000 K
6000 to 7000 K
What percentage of stars are binary stars?
25%
50%
75%
100%
What do binary stars do?
They collide with each other.
They orbit each other.
They move away from each other.
They remain stationary.
What can binary stars be used to determine?
The temperature of a star.
The color of a star.
The mass of a star.
The age of a star.
Around what point do binary stars orbit each other?
Center of gravity.
Center of light.
Center of mass.
Center of energy.
For stars of equal mass, where is the center of mass located?
At the edge.
In the center.
Near the larger star.
Near the smaller star.
If one star is more massive than the other, where will the center of mass be?
Closer to the less massive one.
At the midpoint.
Closer to the more massive one.
At the edge of the orbit.
If the size of the orbit is known, what can be determined?
The temperature of the stars.
The distance between the stars.
The mass of the stars.
The age of the stars.
What is a lightyear?
The distance light travels in one year
The distance light travels in one month
The distance light travels in one day
The distance light travels in one hour
How many kilometers does light travel in one year?
9.5 billion kilometers
9.5 trillion kilometers
5.8 billion kilometers
5.8 trillion kilometers
How many miles does light travel in one year?
5.8 billion miles
9.5 billion miles
5.8 trillion miles
9.5 trillion miles
How long would it take a space probe moving at 36,000 mph to travel one light year?
18,449 years
1,849 years
184,490 years
18,490 years
What is the closest star to our sun?
Alpha Centauri
Barnard's Star
Proxima Centauri
WISE 0855-0714
How far away is Proxima Centauri from our sun?
2.3 light years
4.3 light years
6.3 light years
8.3 light years
What is apparent magnitude?
A star's size as it appears from Earth
A star's brightness as it appears from Earth
A star's distance from Earth
A star's temperature as it appears from Earth
Which of the following factors does NOT control how bright a star appears?
Mass
Temperature
Distance
Color
What is the apparent magnitude of the Sun?
0
-1.4
-26.7
0.8
Which star has an apparent magnitude of 0?
The Sun
Alpha Centauri
Sirius
Betelgeuse
What is the distance in light years of Betelgeuse from Earth?
4.27
8.7
520
NA
According to the table, which star is the closest to Earth?
The Sun
Sirius
Betelgeuse
What happens to a star's brightness as the apparent magnitude number increases?
The star becomes brighter
The star becomes dimmer
The star's temperature increases
The star's distance decreases
Which of the following planets is the smallest in size?
Earth
Venus
Mars
Mercury
Which planet is larger than Uranus but smaller than Jupiter?
Earth
Neptune
Saturn
Venus
What does the Hertzsprung-Russell Diagram show?
The lifecycle of planets
The evolution of stars
The formation of galaxies
The movement of asteroids
In the Hertzsprung-Russell Diagram, what type of stars are found in the upper right corner?
White dwarfs
Main sequence stars
Supergiants
Neutron stars
Which axis on the Hertzsprung-Russell Diagram represents the surface temperature of stars?
The horizontal axis
The vertical axis
The diagonal axis
The curved axis
In the Hertzsprung-Russell Diagram, where is the Sun located?
Among the white dwarfs
Among the supergiants
Among the main sequence stars
Among the giants
What is the birthplace for stars?
Black holes
Nebula of Hydrogen and Helium
Planets
Comets
What happens to stars if they become concentrated?
They will expand
They will explode
They will contract
They will disappear
What force pulls every particle to the center during the formation of a star?
Electromagnetic force
Nuclear force
Gravitational force
Frictional force
What type of light do stars radiate when the temperature is high enough?
Ultraviolet light
Longwave red light
Blue light
Green light
What are stars called when they are not hot enough yet for fusion?
White dwarfs
Neutron stars
Protostars
Supernovae
What happens when a protostar reaches 10 million Kelvin?
The star becomes a red giant.
The pressure is so intense that fusion starts.
The star explodes.
The star cools down.
What effect does the increased movement of gases have in a protostar?
It lowers the gas pressure.
It raises the gas pressure.
It causes the star to shrink.
It cools the star down.
What balances with the inward directed gravity in a protostar?
The force of pressure.
The force of fusion.
The force of cooling.
The force of expansion.
What stage does a star enter after the protostar stage?
Red giant stage.
White dwarf stage.
Main sequence star stage.
Supernova stage.
What force is trying to squeeze the star into a small ball during the Main Sequence Stage?
Electromagnetic force
Nuclear force
Gravitational force
Centrifugal force
What balances the force of gravity during the Main Sequence Stage?
Magnetic pressure
Outward pressure from the core
Centripetal force
Radiation pressure
During the Main Sequence Stage, what is the change in the star?
Rapid change
Moderate change
Little change
No change
What percentage of a star's life cycle is spent in the Main Sequence Stage?
50%
70%
90%
100%
What happens when the hydrogen in a star is consumed?
The star explodes
The star becomes a black hole
The star leaves a helium-rich core
The star becomes a neutron star
What causes the temperature of the core to increase during the Red Giant Stage?
The core expands
The core contracts
The star moves closer to the sun
The star absorbs more light
What does a star become when it enters the Red Giant Stage?
A black hole
A neutron star
A red giant
A white dwarf
What do massive stars become during the Red Giant Stage?
White dwarfs
Supergiants
Neutron stars
Black holes
What happens to a star as it expands during the Red Giant Stage?
It heats up and emits blue light
It cools and emits red light
It becomes a black hole
It stops emitting light
What eventually stops the outward expansion of a star?
Nuclear fusion
Gravity
Radiation pressure
Magnetic fields
What temperature does the core of a collapsing star reach, causing Helium to fuse to Carbon?
1,000,000 K
10,000,000 K
100,000,000 K
1,000,000,000 K
What happens to small low mass stars (less than one half the mass of the sun) when they collapse?
They become black holes
They become neutron stars
They become hot, dense white dwarfs
They explode as supernovae
Why do small low mass stars not get hot enough to fuse helium?
Because they have too much hydrogen
Because their mass is small
Because they are too far from other stars
Because they rotate too slowly
What do medium sun-sized stars (up to 8 times the size of the sun) collapse into?
Black holes
Neutron stars
Earth-sized white dwarfs
Red giants
What is the final stage of a low-mass star's life cycle?
Red giant
White dwarf
Neutron star
Black hole
In the life cycle of a medium-mass star, what stage comes after the red giant?
Protostar
Main-sequence star
Planetary nebula
White dwarf
Which type of star can end its life as a black hole?
Low-mass star
Medium-mass star
High-mass star
All of the above
What is the initial stage in the life cycle of all stars?
Protostar
Main-sequence star
Nebula
Red giant
What is the main difference in the final stages of medium-mass stars and high-mass stars?
Medium-mass stars become white dwarfs, while high-mass stars can become neutron stars or black holes.
Medium-mass stars become red supergiants, while high-mass stars become planetary nebulae.
Medium-mass stars become black holes, while high-mass stars become white dwarfs.
Medium-mass stars become neutron stars, while high-mass stars become red giants.
What is the result of a massive star collapsing in a supernova explosion?
White dwarf
Red giant
Neutron star or black hole
Brown dwarf
At what temperature does carbon fuse to neon, magnesium, and sodium in a supernova?
100 million degrees Celsius
500 million degrees Celsius
1 billion degrees Celsius
10 billion degrees Celsius
What happens to the core of a star during a supernova as it heats to a billion degrees?
It cools down
It remains the same
Neon starts to fuse
It turns into a white dwarf
What type of fusion absorbs energy instead of releasing it during a supernova?
Hydrogen fusion
Helium fusion
Iron fusion
Carbon fusion
What is created if a star is 20 times as large as our sun?
White dwarf
Red giant
Neutron star
Black hole
