Astronomers have found evidence that much more mass exists in the outer galaxy. The stars and ________ that orbit in the outer disk are moving faster than they would if the galaxy's mass were concentrated near the________ of the disk. What are the correct terms to fill in the blanks?

dark matter; supermassive black hole

Population I stars are ________ and differ from Population II stars in that they ________.

young, metal-poor stars; are found in the galactic halo

young, metal-rich stars; have higher metallicity than Population II stars

old, metal-poor stars; have lower metallicity than Population II stars

old, metal-rich stars; are found in globular clusters

The type of stars found in the halo and bulge indicates:

that they are old and formed first

that they are young and metal-rich

The two theories that explain how the spiral arms are maintained are:

Spiral density and self-propagating star formation theory

Big Bang theory and steady state theory

Plate tectonics theory and quantum theory

Relativity theory and string theory

Disklike galaxies with spiral arms are divided into which of the following two subclasses?

normal spirals and barred spirals

normal spirals and flat spirals

flat spirals and barred spirals

What are the three possible outcomes for the universe?

open universe, closed universe, and flat universe

expanding universe, closed universe, and flat universe

open universe, closed universe, and static universe

open universe, barred universe, and flat universe

All three possible outcomes for the universe are based on the premise that the rate of expansion has

remained the same since the beginning of the universe.

slowed down since the beginning of the universe.

increased since the beginning of the universe.

doubled since the beginning of the universe.

The total amount of matter in the universe is expressed in terms of the

average critical density of matter.

Observations of visible galaxies reveal a(n)

average density much less than critical density.

average density equal to critical density.

absolute density greater than average critical density.

critical density much less than average density.

bulge in center with extending arms

Galaxies and the Universe (Study Guide Mastery Ch. 31)

Authored by Anna Luehrs

Science

11th Grade

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Galaxies and the Universe (Study Guide Mastery Ch. 31)

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stars in the giant branch of the H-R diagram that pulsate in brightness because of the expansion and contraction of their layers.

a. Cepheid variables

b. luminosity

c. RR Lyrae variables

d. Sagittarius

e. variable stars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stars that have periods of pulsations between 1.5 hours and 1 day, and on average, have the same luminosity.

a. Cepheid variables

b. luminosity

c. RR Lyrae variables

d. Sagittarius

e. variable stars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Stars with pulsation periods between 1 day and more than 100 days.

a. Cepheid variables

b. luminosity

c. RR Lyrae variables

d. Sagittarius

e. variable stars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

By measuring a star's period of pulsation, astronomers can determine this.

Cepheid variables

luminosity

RR Lyrae variables

Sagittarius

variable stars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Radio waves are used to map the Milky Way because they can penetrate the interstellar gas and dust without being scattered or absorbed.

True

False

The Milky Way's galactic nucleus is surrounded by a nuclear bulge that sticks out of the galactic disk.

True

False

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Around the Milky Way's nuclear bulge and disk is the halo, where the globular clusters are located.

True

False

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Galaxies and the Universe (Study Guide Mastery Ch. 31)

Stars in the giant branch of the H-R diagram that pulsate in brightness because of the expansion and contraction of their layers.

Stars that have periods of pulsations between 1.5 hours and 1 day, and on average, have the same luminosity.

Stars with pulsation periods between 1 day and more than 100 days.

By measuring a star's period of pulsation, astronomers can determine this.

Radio waves are used to map the Milky Way because they can penetrate the interstellar gas and dust without being scattered or absorbed.

The Milky Way's galactic nucleus is surrounded by a nuclear bulge that sticks out of the galactic disk.

Around the Milky Way's nuclear bulge and disk is the halo, where the globular clusters are located.

The Sun is located in the Milky Way's minor arm Orion at a distance of 28,000 ly from the galactic center.

The mass located within the circle of the Sun's orbit through the galaxy is about times the mass of the Sun. Because the Sun is of average mass, astronomers have concluded there are about 100 billion stars within the disk of the .

Astronomers have found evidence that much more mass exists in the outer galaxy. The stars and that orbit in the outer disk are moving faster than they would if the galaxy's mass were concentrated near the of the disk. What are the correct terms to fill in the blanks?

Access all questions and much more by creating a free account

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Galaxies and the Universe (Study Guide Mastery Ch. 31)

Stars in the giant branch of the H-R diagram that pulsate in brightness because of the expansion and contraction of their layers.

Stars that have periods of pulsations between 1.5 hours and 1 day, and on average, have the same luminosity.

Stars with pulsation periods between 1 day and more than 100 days.

By measuring a star's period of pulsation, astronomers can determine this.

Radio waves are used to map the Milky Way because they can penetrate the interstellar gas and dust without being scattered or absorbed.

The Milky Way's galactic nucleus is surrounded by a nuclear bulge that sticks out of the galactic disk.

Around the Milky Way's nuclear bulge and disk is the halo, where the globular clusters are located.

The Sun is located in the Milky Way's minor arm Orion at a distance of 28,000 ly from the galactic center.

The mass located within the circle of the Sun's orbit through the galaxy is about ________ times the mass of the Sun. Because the Sun is of average mass, astronomers have concluded there are about 100 billion stars within the disk of the ________.

Astronomers have found evidence that much more mass exists in the outer galaxy. The stars and ________ that orbit in the outer disk are moving faster than they would if the galaxy's mass were concentrated near the________ of the disk. What are the correct terms to fill in the blanks?

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The mass located within the circle of the Sun's orbit through the galaxy is about times the mass of the Sun. Because the Sun is of average mass, astronomers have concluded there are about 100 billion stars within the disk of the .

Astronomers have found evidence that much more mass exists in the outer galaxy. The stars and that orbit in the outer disk are moving faster than they would if the galaxy's mass were concentrated near the of the disk. What are the correct terms to fill in the blanks?