# Stars And Galaxies Mcfadden Core 1

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Questions: 48 | Attempts: 39

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• 1.

### The positions of the constellations appear to change throughout the year because ____.

• A.

Earth revolves around the Moon

• B.

Earth revolves around the Sun

• C.

The constellations revolve around Earth

• D.

The Sun revolves around Earth

B. Earth revolves around the Sun
Explanation
The positions of the constellations appear to change throughout the year because Earth revolves around the Sun. As Earth orbits the Sun, it moves to different positions in space, causing the perspective from which we view the constellations to change. This phenomenon is known as the apparent motion of the stars and is responsible for the different constellations being visible in different seasons.

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• 2.

### Its _________________ makes Sirius the brightest star in the sky.

• A.

Apparent magnitude

• B.

Parallax

• C.

Color

• D.

Absolute magnitude

A. Apparent magnitude
Explanation
The apparent magnitude is a measure of the brightness of a star as seen from Earth. Sirius is the brightest star in the sky because it has a high apparent magnitude. This means that it appears very bright to us, even though its actual brightness (absolute magnitude) may be different. The apparent magnitude takes into account factors such as distance and intrinsic brightness, allowing us to compare the brightness of stars despite their varying distances from Earth.

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• 3.

### The distances to nearby stars can be measured by using ______________.

• A.

Absolute magnitude

• B.

Temperature

• C.

Color

• D.

Parallax

D. Parallax
Explanation
Parallax is the correct answer because it is a method used to measure the distances to nearby stars. Parallax involves observing the apparent shift in the position of a star when viewed from different points in Earth's orbit around the Sun. By measuring this shift, astronomers can calculate the distance to the star using trigonometry. This method is particularly effective for measuring the distances to relatively close stars within a few hundred light-years from Earth.

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• 4.

### About 90% of the stars in space are ___________________ stars.

• A.

Nebula

• B.

Giant

• C.

Main sequence

• D.

White dwarf

C. Main sequence
Explanation
The main sequence is the most common type of star in the universe. It is the stage in a star's life cycle where it fuses hydrogen into helium in its core, producing a steady amount of energy. This stage lasts for the majority of a star's lifetime. Therefore, it is reasonable to conclude that about 90% of the stars in space are main sequence stars.

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• 5.

### The hottest stars in space are __________ color.

• A.

Yellow

• B.

Red

• C.

Blue

• D.

White

C. Blue
Explanation
Blue stars are the hottest stars in space. The color of a star is determined by its surface temperature. Blue stars have the highest surface temperature, which means they emit the most energy and appear the hottest. On the other hand, red stars are cooler, followed by yellow and white stars. Therefore, blue is the correct answer as it indicates the hottest stars in space.

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• 6.

### A main sequence star becomes a _________ after it uses up the hydrogen in its core.

• A.

Nebula

• B.

Supernova

• C.

Black hole

• D.

Giant

D. Giant
Explanation
After a main sequence star exhausts the hydrogen in its core, it undergoes a phase known as a "giant." During this stage, the star expands and becomes larger in size, while its outer layers become cooler and redder. This expansion occurs because the core begins to fuse helium, releasing energy and causing the outer layers to expand. The star remains in this giant phase until it exhausts its helium fuel, at which point it may undergo further evolution and potentially become a supernova, black hole, or other stellar remnant.

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• 7.

### The Sun produces energy by fusing hydrogen atoms into ________ atoms in its core.

• A.

Carbon

• B.

Helium

• C.

Iron

• D.

Oxygen

B. Helium
Explanation
The Sun produces energy by fusing hydrogen atoms into helium atoms in its core. This process, known as nuclear fusion, occurs at extremely high temperatures and pressures. In the core of the Sun, hydrogen atoms collide and fuse together to form helium atoms, releasing a tremendous amount of energy in the process. This energy is what powers the Sun and allows it to emit light and heat.

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• 8.

### The intense magnetic fields of sunspots cause archlike eruptions called ______________.

• A.

Solar eclipses

• B.

Corona

• C.

Photospheres

• D.

Prominences

D. Prominences
Explanation
Prominences are archlike eruptions caused by the intense magnetic fields of sunspots. These eruptions are large, bright, and extend outward from the Sun's surface, often looping back and connecting with other parts of the Sun's magnetic field. Unlike solar eclipses, which occur when the Moon blocks the Sun's light, prominences are a feature of the Sun itself. The corona refers to the outer atmosphere of the Sun, while the photosphere is the visible surface of the Sun. Therefore, prominences are the correct answer.

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• 9.

### Our Sun is NOT ___________.

• A.

A part of a binary system

• B.

A main sequence star

• C.

In a galaxy

• D.

A medium hot star

A. A part of a binary system
Explanation
The Sun is not a part of a binary system because it is a solitary star, meaning it does not have a companion star that it orbits around. A binary system consists of two stars that orbit around a common center of mass. The Sun is a main sequence star, which means it is in the phase of its life where it is fusing hydrogen into helium in its core. It is also located in a galaxy, specifically the Milky Way galaxy. Lastly, the Sun is classified as a medium hot star, with an average surface temperature of about 5,500 degrees Celsius.

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• 10.

### A galaxy that has a shape similar to a football is a(n) _____________ galaxy.

• A.

Normal spiral

• B.

Barred spiral

• C.

Elliptical

• D.

Irregular

C. Elliptical
Explanation
An elliptical galaxy is a type of galaxy that has a shape similar to a football. Unlike spiral galaxies, which have distinct arms, or irregular galaxies, which lack a defined shape, elliptical galaxies have a smooth, elongated shape. This shape is often described as resembling a football, hence the correct answer.

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• 11.

### All of the following are true of the Milky Way EXCEPT that it ___________________.

• A.

Is a spiral galaxy

• B.

Has more than 800 billion stars

• C.

Is a member of the Local Group

• D.

Is 100,000 light years across

B. Has more than 800 billion stars
Explanation
The given statement "has more than 800 billion stars" is incorrect because the Milky Way actually has more than 100 billion stars.

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• 12.

### The Big Bang theory of the formation and expansion of our universe is supported by the observed ___________.

• A.

Blue-violet shift

• B.

Red shift

• C.

"big crunch"

• D.

Shorter wave lengths

B. Red shift
Explanation
The observed red shift supports the Big Bang theory because it indicates that galaxies are moving away from each other. This is consistent with the idea that the universe is expanding, as predicted by the Big Bang theory.

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• 13.

### Although it has a greater ____ than Sirius, Rigel does NOT look as bright in the night sky.

• A.

Apparent magnitude

• B.

Parallax

• C.

Black hole

• D.

Absolute magnitude

D. Absolute magnitude
Explanation
Rigel does not look as bright in the night sky compared to Sirius because although it has a greater apparent magnitude, its absolute magnitude is lower. Absolute magnitude is a measure of the intrinsic brightness of a celestial object, while apparent magnitude is a measure of how bright an object appears from Earth. Therefore, even though Rigel may have a greater apparent magnitude, its absolute magnitude is lower, indicating that it is not as bright as Sirius.

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• 14.

### A _______ is a region so dense that nothing, including light, can escape its gravity field.

• A.

Supernova

• B.

White dwarf

• C.

Black hole

• D.

Supergiant

C. Black hole
Explanation
A black hole is a region in space that is extremely dense and has a gravitational pull so strong that nothing, including light, can escape from it. This occurs when a massive star collapses under its own gravity, creating a singularity with infinite density and a gravitational field that is too powerful for anything to escape from. Therefore, a black hole fits the description of a region so dense that nothing, including light, can escape its gravity field.

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• 15.

### Dark, cooler areas of the Sun's surface are called ___________.

• A.

Sunspots

• B.

Solar flares

• C.

Coronas

• D.

Prominences

A. Sunspots
Explanation
Sunspots are dark, cooler areas on the Sun's surface that appear darker than the surrounding areas because they are cooler. They are caused by magnetic activity on the Sun and are often associated with solar flares and other solar phenomena. Sunspots can vary in size and shape and are temporary features on the Sun's surface.

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• 16.

### The Clouds of Magellan are two __________ galaxies orbiting the Milky Way.

• A.

Normal spiral

• B.

Barred spiral

• C.

Irregular

• D.

Elliptical

C. Irregular
Explanation
The Clouds of Magellan are two irregular galaxies orbiting the Milky Way. Irregular galaxies do not have a distinct shape or structure, unlike spiral or elliptical galaxies. They often have a chaotic appearance and contain a mix of young and old stars. The Clouds of Magellan, also known as the Large and Small Magellanic Clouds, are irregular galaxies that are visible from the southern hemisphere and are considered satellite galaxies of the Milky Way.

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• 17.

### The coolest stars in the sky are _______ in color.

• A.

Yellow

• B.

Red

• C.

Blue

• D.

White

B. Red
Explanation
The coolest stars in the sky are red in color. This is because the color of a star is determined by its temperature. Cooler stars emit less energy and have lower surface temperatures, causing them to appear red. On the other hand, hotter stars emit more energy and have higher surface temperatures, making them appear blue or white. Therefore, red stars are considered the coolest in terms of temperature.

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• 18.

### A group of stars, gas, and dust held together by gravity is a

• A.

Galaxy

• B.

Constellation

• C.

Local Group

• D.

Both a and b

A. Galaxy
Explanation
A group of stars, gas, and dust held together by gravity is referred to as a galaxy. Galaxies are vast systems that can contain billions of stars, along with various amounts of gas and dust. They are bound together by the force of gravity, creating a cohesive structure. Constellations, on the other hand, are patterns of stars as seen from Earth, but they are not physically connected or held together. The Local Group is a specific group of galaxies that includes the Milky Way and several other nearby galaxies. Therefore, the correct answer is galaxy.

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• 19.

### The sequence of star colors from hottest to coolest is ______________.

• A.

Blue, yellow, orange, red

• B.

Red, orange, yellow, blue

• C.

Blue, red, yellow, orange

• D.

Yellow, blue, orange, red

A. Blue, yellow, orange, red
Explanation
The sequence of star colors from hottest to coolest is blue, yellow, orange, red. This is because the temperature of a star determines its color, with hotter stars appearing blue and cooler stars appearing red. Yellow falls between blue and orange in terms of temperature, making it the second hottest color in the sequence. Orange is cooler than yellow but hotter than red, making it the third color in the sequence. Finally, red is the coolest color among the given options, making it the last color in the sequence.

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• 20.

### _________ are patterns of stars in the sky.

• A.

Galaxies

• B.

Constellations

• C.

Star clusters

• D.

Binaries

B. Constellations
Explanation
Constellations are patterns of stars in the sky that have been recognized and named by different cultures throughout history. They are groups of stars that appear to form a distinct shape or figure when observed from Earth. Constellations have been used for navigation, storytelling, and as a way to mark the changing seasons. They are not galaxies, which are massive systems of stars, gas, and dust held together by gravity. Star clusters are groups of stars that are physically close to each other, while binaries are pairs of stars that orbit around a common center of mass.

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• 21.

### As Earth travels in its ____________, different constellations are visible at different times of the year.

• A.

Atmosphere

• B.

Orbit

• C.

Galaxy

• D.

Star cluster

B. Orbit
Explanation
As Earth travels in its orbit around the Sun, different constellations become visible at different times of the year. This is because as Earth orbits the Sun, its position changes relative to the stars, causing different constellations to come into view. The tilt of Earth's axis also plays a role, as it causes the apparent path of the Sun across the sky to change throughout the year, further influencing which constellations are visible at different times.

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• 22.

### A measure of the amount of light given off by a star is its ___________________

• A.

Apparent magnitude

• B.

Absolute magnitude

• C.

Position in space

• D.

Size

B. Absolute magnitude
Explanation
The correct answer is absolute magnitude. Absolute magnitude is a measure of the amount of light given off by a star, independent of its distance from Earth. It represents the intrinsic brightness of the star and allows astronomers to compare the luminosity of different stars. Apparent magnitude, on the other hand, is a measure of how bright a star appears from Earth and is affected by both the star's intrinsic brightness and its distance from us. Position in space and size are not directly related to the amount of light emitted by a star.

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• 23.

### A measure of the amount of light received on Earth is a star's  _________________.

• A.

Apparent magnitude

• B.

Absolute magnitude

• C.

Position in space

• D.

Size

A. Apparent magnitude
Explanation
Apparent magnitude is a measure of the amount of light received on Earth from a star. It indicates how bright a star appears to an observer on Earth. This measurement takes into account the star's distance from Earth, as well as its intrinsic brightness. The apparent magnitude scale is logarithmic, meaning that each whole number increase or decrease represents a factor of 2.5 in brightness. Therefore, a star with a lower apparent magnitude appears brighter to us on Earth.

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• 24.

### ______________ is the apparent shift in the position of an object when viewed from two different locations.

• A.

Apparent magnitude

• B.

Absolute magnitude

• C.

Parallax

• D.

The Doppler shift

C. Parallax
Explanation
Parallax is the apparent shift in the position of an object when viewed from two different locations. This phenomenon occurs due to the difference in the observer's line of sight. When an object is observed from two different positions, it appears to have moved relative to the background. Parallax is commonly used in astronomy to measure the distance to celestial objects. By observing the apparent shift in the position of a star from different points on Earth's orbit, astronomers can calculate its distance from Earth.

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• 25.

### A star begins as a ___________, a large cloud of gas and dust.

• A.

Nebula

• B.

Giant

• C.

Dwarf

• D.

Black hole

A. Nebula
Explanation
A star begins as a nebula, which is a large cloud of gas and dust. This cloud of gas and dust collapses under its own gravity, causing it to heat up and form a protostar. As the protostar continues to gather more mass, it eventually reaches a point where nuclear fusion begins in its core, and it becomes a full-fledged star. Therefore, the correct answer is nebula.

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• 26.

### The Sun produces energy by forming __________ in its core.

• A.

Carbon

• B.

Helium

• C.

Hydrogen

• D.

Oxygen

B. Helium
Explanation
In the core of the Sun, hydrogen atoms undergo a process called nuclear fusion, where they combine to form helium atoms. This fusion process releases a tremendous amount of energy in the form of light and heat. Therefore, the Sun produces energy by forming helium in its core.

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• 27.

### Prominences and flares on the Sun are related to sunspots because they all are caused by ________.

• A.

Electricity

• B.

Too much heat

• C.

Earth's orbit around the sun

• D.

Intense magnetic fields

D. Intense magnetic fields
Explanation
Prominences and flares on the Sun are related to sunspots because they all are caused by intense magnetic fields. Sunspots are areas on the Sun's surface where the magnetic field is concentrated, causing a decrease in temperature and resulting in cooler, darker spots. Prominences are large, bright loops of gas that extend outwards from the Sun's surface and are also influenced by the magnetic field. Flares, on the other hand, are sudden releases of energy in the form of intense radiation and particles, which are triggered by the disruption of the Sun's magnetic field. Therefore, all three phenomena are interconnected and influenced by the intense magnetic fields on the Sun.

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• 28.

### The number of observed sunspots, prominences, and flares increases in a cycle that occurs every _______ years.

• A.

11

• B.

15

• C.

20

• D.

31

C. 20
Explanation
The number of observed sunspots, prominences, and flares increases in a cycle that occurs every 20 years. This indicates that there is a regular pattern of solar activity, where these phenomena become more frequent and intense every 20 years. This cycle is known as the solar cycle, and it is caused by the magnetic field of the Sun reversing its polarity every 11 years, resulting in increased solar activity.

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• 29.

### Our Sun is considered average because its temperature and absolute magnitude place it in the _______ range of the H-R diagram.

• A.

White dwarf

• B.

Red giant

• C.

Main sequence

• D.

Supergiant

C. Main sequence
Explanation
The Sun is considered average because its temperature and absolute magnitude place it in the main sequence range of the H-R diagram. The main sequence is a diagonal band on the H-R diagram where stars spend the majority of their lives, including the Sun. This range represents stars that are in a stable phase of their evolution, converting hydrogen into helium in their cores. The Sun's position in the main sequence indicates that it is in a relatively stable phase of its life cycle, making it an average star.

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• 30.

### Our Sun is unusual because it does not belong to a(n) _________________.

• A.

Solar system

• B.

Universe

• C.

Galaxy

• D.

Binary star system

D. Binary star system
Explanation
Our Sun is unusual because it does not belong to a binary star system. Most stars in the universe exist in binary star systems, where two stars orbit around a common center of mass. However, our Sun is a solitary star, meaning it does not have a companion star that it orbits with. This makes our Sun unique compared to the majority of stars in the universe.

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• 31.

### Two stars orbit each other in a(n) _________________ star system.

• A.

Binary

• B.

Closed

• C.

Single

• D.

Individual

A. Binary
Explanation
The correct answer is "binary" because in a binary star system, two stars orbit each other. This is different from a single star system where only one star is present. The terms "closed" and "individual" do not accurately describe a system with two orbiting stars.

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• 32.

### The spiral shape of the Milky Way Galaxy CANNOT be seen from Earth because _________________.

• A.

We are located above the galaxy

• B.

We are located within one of its spiral arms

• C.

Our view is blocked by the sun

• D.

None of the above

B. We are located within one of its spiral arms
Explanation
The spiral shape of the Milky Way Galaxy cannot be seen from Earth because we are located within one of its spiral arms.

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• 33.

### The ____________ states that between 15 and 20 billion years ago, the universe began expanding out of an enormous explosion.

• A.

H-R Diagram

• B.

Binary Star theory

• C.

Big Bang theory

• D.

"big crunch" theory

C. Big Bang theory
Explanation
The correct answer is Big Bang theory. This theory suggests that the universe started expanding from a highly dense and hot state around 15 to 20 billion years ago. It proposes that the universe originated from a singularity and has been expanding ever since. The Big Bang theory is supported by various pieces of evidence, such as the observed redshift of distant galaxies and the cosmic microwave background radiation.

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• 34.

### A red shift in the spectrum of the light from an object indicates the object is moving _________________ you.

• A.

Away from

• B.

Toward

• C.

At a right angle from

• D.

None of the above

A. Away from
Explanation
A red shift in the spectrum of the light from an object indicates that the wavelengths of the light are stretched, causing them to shift towards longer wavelengths. This phenomenon is known as the Doppler effect. In the context of light, a red shift suggests that the object emitting the light is moving away from the observer. This is because as the object moves away, the wavelengths of the light it emits get stretched, resulting in a shift towards the red end of the spectrum. Therefore, the correct answer is "away from".

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• 35.

### A galaxy type without a definite shape is called a(n) ___________________.

• A.

Elliptical galaxy

• B.

Irregular galaxy

• C.

Barred spiral galaxy

• D.

Spin-off galaxy

B. Irregular galaxy
Explanation
An irregular galaxy is a galaxy type without a definite shape. Unlike other galaxy types such as elliptical or spiral galaxies, irregular galaxies do not have a symmetrical or organized structure. They often appear chaotic and disorganized, with no distinct arms or central bulge. Irregular galaxies are typically smaller and contain younger stars, as they have not undergone the same level of evolution and organization as other galaxy types.

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• 36.

### Recent evidence has suggested that the Milky Way Galaxy may be classified as a(n) ________________ .

• A.

Elliptical galaxy

• B.

Irregular galaxy

• C.

Barred spiral galaxy

• D.

Spin-off galaxy

C. Barred spiral galaxy
Explanation
The recent evidence suggests that the Milky Way Galaxy may be classified as a barred spiral galaxy. This classification is based on the presence of a bar-like structure at the center of the galaxy, which is surrounded by spiral arms. The presence of a bar is observed in the Milky Way, as well as in other galaxies, and it plays a significant role in the formation and evolution of the galaxy. Therefore, based on this evidence, the Milky Way is most likely a barred spiral galaxy.

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• 37.

### A distance measurement based on the speed of light and is used for objects in space is called a  ___________.

• A.

Parallax

• B.

Light year

• C.

H-R diagram

• D.

Astronomical Unit (AU)

B. Light year
Explanation
A distance measurement based on the speed of light and is used for objects in space is called a light year. This unit of measurement represents the distance that light travels in one year in a vacuum. Since light travels at a constant speed, using light years allows astronomers to accurately measure vast distances in space, which would be impractical to measure using other units.

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• 38.

### The graph that shows the relationship of a star's temperature to its absolute magnitude is called  ____________.

• A.

A parallax

• B.

An H-R Diagram

• C.

A syntax

• D.

A barred spiral

B. An H-R Diagram
Explanation
An H-R Diagram, also known as a Hertzsprung-Russell Diagram, shows the relationship between a star's temperature and its absolute magnitude. This graph is used to classify and understand the different stages of stellar evolution based on their position on the diagram. By plotting the temperature on the x-axis and the absolute magnitude on the y-axis, the H-R Diagram provides valuable information about the characteristics and life cycle of stars.

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• 39.

### The Milky way galaxy is said to be ____________________ light years across.

• A.

100,000

• B.

10,000

• C.

1,000,000

• D.

1,000

A. 100,000
Explanation
The Milky Way galaxy is estimated to be approximately 100,000 light years across. This means that it would take light 100,000 years to travel from one end of the galaxy to the other. The Milky Way is a spiral galaxy that contains billions of stars, including our own sun. Its vast size is one of the reasons why it is visible as a faint band of light in the night sky.

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• 40.

### The stage in a star's evolution formed as the core of the main sequence star uses up its helium and the outer core is blown off into space.

• A.

Red giant

• B.

White dwarf

• C.

Supernova

• D.

High mass star

B. White dwarf
Explanation
A white dwarf is formed when a star's core exhausts its helium fuel and the outer core is expelled into space. This stage occurs after the main sequence stage, where the star fuses hydrogen into helium. As the core runs out of helium, it collapses under its own gravity, causing the outer layers to expand and form a red giant. Eventually, the outer layers are blown off, leaving behind a dense, hot core known as a white dwarf. This stage marks the end of a low to medium mass star's evolution.

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• 41.

### If the diagram below depicts the life cycle of a star, letter B would be identified as a ___________.

• A.

Main sequence star

• B.

Neutron star

• C.

White dwarf

• D.

Supernova

A. Main sequence star
Explanation
In the diagram, letter B is identified as a main sequence star. This is because a main sequence star is in the longest and most stable phase of its life cycle, where it fuses hydrogen into helium in its core. This is the phase where stars, like our Sun, spend the majority of their lifetime.

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• 42.

### According to the H-R Diagram below, red giants are hotter than white dwarfs.

• A.

True

• B.

False

B. False
Explanation
The H-R Diagram is a graph that shows the relationship between the luminosity (brightness) and temperature of stars. On the diagram, red giants are located in the top right corner, indicating that they are bright but cool. On the other hand, white dwarfs are located in the bottom left corner, indicating that they are dimmer but hotter. Therefore, the statement that red giants are hotter than white dwarfs is false.

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• 43.

### According to the H-R diagram below, Betelgeuse is considered a ______________ star.

• A.

Giant

• B.

Super Giant

• C.

White Dwarf

• D.

Main Sequence

B. Super Giant
Explanation
Based on the information provided in the H-R diagram, Betelgeuse is classified as a Super Giant star. This can be determined by analyzing its position on the diagram, where it appears to be located in the upper right region. Super Giants are massive stars that have evolved past the main sequence phase and have expanded to become larger and brighter. Therefore, the correct answer is Super Giant.

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• 44.

### According to the H-R diagram below, our sun is brighter than a white dwarf star.

• A.

True

• B.

False

A. True
Explanation
The H-R diagram is a plot of the luminosity (brightness) of stars against their temperature. Based on the diagram, we can see that our sun falls into the main sequence, which is a band of stars that includes most of the stars in the universe. White dwarf stars, on the other hand, are located in a different region of the diagram, known as the white dwarf sequence, which is below the main sequence. Since our sun is in the main sequence, it has a higher luminosity (brightness) compared to white dwarf stars. Therefore, the statement that our sun is brighter than a white dwarf star is true.

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• 45.

### According to the H-R diagram below, the approximte absolute magnitude of Rigel is ___________.

• A.

0

• B.

-5

• C.

-2.5

• D.

+2.5

C. -2.5
Explanation
The H-R diagram is a plot of stars' luminosity (absolute magnitude) against their surface temperature (spectral type). The answer can be determined by looking at the position of Rigel on the H-R diagram. Based on its position, Rigel has an approximate absolute magnitude of -2.5.

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• 46.

### According to the H-R Diagram below,the Sun is hotter than Vega.

• A.

True

• B.

False

B. False
Explanation
The H-R Diagram is a plot of stars based on their luminosity and temperature. In this diagram, the Sun is located in the main sequence, while Vega is located in the upper part of the diagram, known as the main sequence turnoff. Stars in the main sequence turnoff are hotter and more luminous than stars in the main sequence. Therefore, based on the H-R Diagram, Vega is hotter than the Sun, making the given answer "False" correct.

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• 47.

### If the diagram below depicts the life cycle of a star, letter F would be identified as a ___________.

• A.

Main sequence star

• B.

Neutron star

• C.

White dwarf

• D.

Supernova

C. White dwarf
Explanation
In the given diagram depicting the life cycle of a star, letter F is identified as a white dwarf. A white dwarf is a small, dense star that is formed when a main sequence star exhausts its nuclear fuel and collapses under its own gravity. It is the final stage in the life cycle of a low to medium mass star, like our Sun. A white dwarf consists mainly of carbon and oxygen and gradually cools down over billions of years.

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• 48.

### If the diagram below depicts the life cycle of a star, letter E would be identified as a ___________.

• A.

Main sequence star

• B.

Neutron star

• C.

White dwarf

• D.

Supernova

B. Neutron star
Explanation
The diagram depicts the life cycle of a star, and letter E is identified as a neutron star. This is because a neutron star is formed after a massive star undergoes a supernova explosion. The core of the star collapses under its own gravity, resulting in a dense and compact object known as a neutron star. Neutron stars are extremely dense and have a high gravitational pull.

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