The Expansion Of Space

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Questions Bank

Our Place in the Universe
Patterns in the Skymotions of Earth
Laws of Motion
Light and Telescopes
The Formation of Stars and Planets
Terrestrial Worlds in the Inner Solar System
Atmospheres of Venus, Earth, and Mars
The Giant Planets
Small Bodies of the Solar System
Measuring the Stars
Our Star: The Sun
Evolution of Low-Mass Stars
Evolution of High-Mass Stars
The Expansion of Space
The Realm of the Galaxies
Our Galaxy: The Milky Way
Modern Cosmology and the Origin of Structure
Life in the Universe

All Questions

Question 1

Free

True/False

In the Great Debate of 1920,Curtis argued that spiral nebulae were individual galaxies,while Shapley argued spiral nebulae must be part of the Milky Way because the Milky Way was very large in size.

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True

False

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Question 2

Free

True/False

The Cosmological Principle says that physical laws that are true in one part of the universe must be true in every part of the universe.

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True

False

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Question 3

Free

True/False

The figure below shows the spectrum of a star whose motion compared to our star is nearly stationary within the Milky Way Galaxy.The shift in the galaxy spectrum indicates that the galaxy is moving quickly toward our own.

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True

False

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Question 4

Free

True/False

We can measure the value of H₀ directly with no intermediate steps.

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True

False

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Question 5

Free

True/False

When we measure distances to very faint galaxies with Type Ia supernovae,the accuracy of the measurement is only as good as that of the calibration of the Cepheids.

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True

False

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Question 6

True/False

There is no special center to the expansion of the universe.

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True

False

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Question 7

True/False

As the universe expands,the sizes of galaxies expand a measurable amount as well.

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True

False

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Question 8

True/False

The value of the scale factor R_U depends on the value of redshift z.

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True

False

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Question 9

True/False

The apparent recessional velocities of galaxies at large distances are due mainly to the actual motions of the galaxies through space.

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True

False

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Question 10

True/False

The current temperature of the cosmic microwave background radiation is 17 K.

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True

False

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Question 11

True/False

The only chemical elements that formed as the universe cooled down after the Big Bang were hydrogen,deuterium,and helium.

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True

False

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Question 12

True/False

The standard Big Bang theory successfully predicts that the fraction of helium by mass in the primordial universe was 2 percent.

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True

False

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Question 13

True/False

The abundance of various elements formed from Big Bang nucleosynthesis depended only on the temperature of normal matter in the early universe.

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True

False

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Question 14

Multiple Choice

In the Great Debate of 1920,Curtis and Shapley argued over whether or not:

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the Big Bang occurred

the age of the universe was 14 billion years

the spiral nebulae were located outside the Milky Way

life existed outside of Earth

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Question 15

Multiple Choice

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

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This universe is homogeneous but not isotropic.

This universe is isotropic but not homogeneous.

This universe is both homogeneous and isotropic.

This universe is neither homogeneous nor isotropic.

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Question 16

Multiple Choice

What do astronomers mean when they say that the universe is homogeneous?

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All stars in all galaxies have planetary systems just like ours.

The universe looks the same no matter where you look.

Galaxies are generally distributed similarly throughout the universe.

Generally speaking,there is little difference between conditions on Earth,in the Sun,or in outer space.

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Question 17

Multiple Choice

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

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This universe is homogeneous but not isotropic.

This universe is isotropic but not homogeneous.

This universe is both homogeneous and isotropic.

This universe is neither homogeneous nor isotropic.

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Question 18

Multiple Choice

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

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This universe is homogeneous but not isotropic.

This universe is isotropic but not homogeneous.

This universe is both homogeneous and isotropic.

This universe is neither homogeneous nor isotropic.

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Question 19

Multiple Choice

The figure below indicates a possible picture of a theoretical universe filled with galaxies moving as shown with two separate observers within it.Which of the following statements describes this universe?

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This universe is homogeneous but not isotropic.

This universe is isotropic but not homogeneous.

This universe is both homogeneous and isotropic.

This universe is neither homogeneous nor isotropic.

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Question 20

Multiple Choice

If we lived on a galaxy one billion light-years from our own,what would we see?

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A universe 1 billion years younger than ours

A universe 1 billion years older than ours

Much the same universe we see today

Nothing-there are no galaxies one billion light-years away from us

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The Expansion Of Space

In the Great Debate of 1920,Curtis argued that spiral nebulae were individual galaxies,while Shapley argued spiral nebulae must be part of the Milky Way because the Milky Way was very large in size.

The Cosmological Principle says that physical laws that are true in one part of the universe must be true in every part of the universe.

The figure below shows the spectrum of a star whose motion compared to our star is nearly stationary within the Milky Way Galaxy.The shift in the galaxy spectrum indicates that the galaxy is moving quickly toward our own.

We can measure the value of H0 directly with no intermediate steps.

When we measure distances to very faint galaxies with Type Ia supernovae,the accuracy of the measurement is only as good as that of the calibration of the Cepheids.

There is no special center to the expansion of the universe.

As the universe expands,the sizes of galaxies expand a measurable amount as well.

The value of the scale factor RU depends on the value of redshift z.

The apparent recessional velocities of galaxies at large distances are due mainly to the actual motions of the galaxies through space.

The current temperature of the cosmic microwave background radiation is 17 K.

The only chemical elements that formed as the universe cooled down after the Big Bang were hydrogen,deuterium,and helium.

The standard Big Bang theory successfully predicts that the fraction of helium by mass in the primordial universe was 2 percent.

The abundance of various elements formed from Big Bang nucleosynthesis depended only on the temperature of normal matter in the early universe.

In the Great Debate of 1920,Curtis and Shapley argued over whether or not:

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

What do astronomers mean when they say that the universe is homogeneous?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

The figure below indicates a possible picture of a theoretical universe with two separate observers within it.Which of the following statements describes this universe?

The figure below indicates a possible picture of a theoretical universe filled with galaxies moving as shown with two separate observers within it.Which of the following statements describes this universe?

If we lived on a galaxy one billion light-years from our own,what would we see?

We can measure the value of H₀ directly with no intermediate steps.

The value of the scale factor R_U depends on the value of redshift z.