Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Accepted Answer

Curtis believed in a smaller galaxy (rou

Question 3

Galaxies move away from us in all directions because:

Accepted Answer

A) the force of gravity increases with distance 
B) the force of gravity weakens with distance 
C) space is expanding 
D) our galaxy has expelled all other galaxies 
E) we are at the center of the expansion of the universe 
A) the force of gravity increases with distance 
B) the force of gravity weakens with distance 
C) space is expanding 
D) our galaxy has expelled all other galaxies 
E) we are at the center of the expansion of the universe

Question 4

Why can Type I supernovae be used to determine a galaxy's distance?

Accepted Answer

A) Type I supernovae occur only in very luminous galaxies. 
B) Type I supernovae have approximately the same luminosity. 
C) Type I supernovae have approximately the same size. 
D) A Type I supernova occurs in a typical galaxy about once every 100 years. 
E) Type I supernovae occur even in very small galaxies. 
A) Type I supernovae occur only in very luminous galaxies. 
B) Type I supernovae have approximately the same luminosity. 
C) Type I supernovae have approximately the same size. 
D) A Type I supernova occurs in a typical galaxy about once every 100 years. 
E) Type I supernovae occur even in very small galaxies.

Question 5

The cosmic microwave background (CMB)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CMB spectrum peaks.

Accepted Answer

λ_peak = 2,900 μm K/T = 2

Question 6

Hubble's constant,H0,represents:

Accepted Answer

A) the rate of expansion of the universe 
B) the speed at which galaxies are moving away from us 
C) the time it takes a galaxy to move twice as far away from us 
D) the size of the universe 
E) the amount of time since the Solar System formed 
A) the rate of expansion of the universe 
B) the speed at which galaxies are moving away from us 
C) the time it takes a galaxy to move twice as far away from us 
D) the size of the universe 
E) the amount of time since the Solar System formed

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

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Galaxies move away from us in all directions because:

Why can Type I supernovae be used to determine a galaxy's distance?

The cosmic microwave background (CMB)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CMB spectrum peaks.

Hubble's constant,H₀,represents:

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 19: The Expanding Universe

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

What were the positions taken by Heber Curtis and Harlow Shapley in their "Great Debate," and how were both of them partially correct?

Galaxies move away from us in all directions because:

Why can Type I supernovae be used to determine a galaxy's distance?

The cosmic microwave background (CMB)has a temperature of approximately 2.7 K and a Planck blackbody spectrum.Calculate the wavelength where the CMB spectrum peaks.

Hubble's constant,H0,represents:

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornments Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Hubble's constant,H₀,represents: