According to the classification system in Ch. 1, the concept of dark matter is classified as:

According to the classification system in Ch. 1, the concept of dark matter is classified as: a) an idea b) a theory c) a law d) a principle Answer:...

The Helium abundance in the current universe

The Helium abundance in the current universe a) is due partly to the Big Bang and partly to stellar nucleosynthesis b) is due only to the Big Bang c)...

T/F The universe became transparent when it cooled below the surface temperature of the sun.

T/F The universe became transparent when it cooled below the surface temperature of the sun. Answer: Tr...

The cosmological redshift in Hubble's law is distinct from the redshift arising from the Doppler effect because

The cosmological redshift in Hubble's law is distinct from the redshift arising from the Doppler effect because a) the redshift happens as the photon...

T/F The cosmological constant makes the expansion of the universe accelerate.

T/F The cosmological constant makes the expansion of the universe accelerate. Answer: Tr...

Which of the following adjectives describes the early universe, as observed through the CMB?

Which of the following adjectives describes the early universe, as observed through the CMB? a) hot b) dense c) loud d) tiny e) vast f) slow g)fast Answer:...

Parallel universes are

Parallel universes are a) an observation b) a law c) a hypothesis d) a theory Answer: ...

The CMB and the Big Bang theory are related because

The CMB and the Big Bang theory are related because a) the CMB is an observation that led to the development of the theory b) Big Bang theory predicted...

The best evidence for dark matter in the Milky Way comes from the observation that the rotation curve

The best evidence for dark matter in the Milky Way comes from the observation that the rotation curve a) is quite flat at a great distance from the...

Astronomers observe two galaxies, A and B. Galaxy A has a recession velocity of 2,500 km/s, while Galaxy B has a recession velocity of 5,000 km/s. This means that

Astronomers observe two galaxies, A and B. Galaxy A has a recession velocity of 2,500 km/s, while Galaxy B has a recession velocity of 5,000 km/s. This...

Astronomers know active galactic nuclei are relatively small because

Astronomers know active galactic nuclei are relatively small because a) variations in brightness occur quickly b) variations in brightness occur slowly c)...

No matter where you travel in space, you would observe very similar distributions of galaxies. This is an example of

No matter where you travel in space, you would observe very similar distributions of galaxies. This is an example of a) isotropy b) homogeneity hydrostatic...

The flat rotation curves of spiral galaxies imply that the distribution of mass resembles

The flat rotation curves of spiral galaxies imply that the distribution of mass resembles a) the solar system; most mass is concentrated in the center b)...

An object that passes near a black hole

An object that passes near a black hole a) always falls in because of gravity b) is sucked in because of vacuum pressure c) is pushed in by photon...

Ivana is standing in a small, windowless room. The force on her feet suddenly ceases. Which of the following conclusions can she draw

Ivana is standing in a small, windowless room. The force on her feet suddenly ceases. Which of the following conclusions can she draw a) she is in...

When photodisintegration starts in a star, a process begins that always results in a

When photodisintegration starts in a star, a process begins that always results in a a) supernova b) black hole c) neutron star d) pulsar Answer:...

A pulsar changes in brightness because its size pulsates.

A pulsar changes in brightness because its size pulsates. Answer: Tr...

If you could draw a very large circle in space near a black hole, its circumference would be:

If you could draw a very large circle in space near a black hole, its circumference would be: a) 2r b) greater than 2r c) less than 2r d) can't be...

Imagine two spaceships travel toward each other. One spaceship travels to the right at the speed of 0.9c and the other travels to the left at 0.9c. The pilot of the spaceship travelling right shoots a yellow laser at the spaceship traveling left. The pilot of the spaceship traveling left observes:

Imagine two spaceships travel toward each other. One spaceship travels to the right at the speed of 0.9c and the other travels to the left at 0.9c....

Pulsations in a Cepheid variable star are controlled by

Pulsations in a Cepheid variable star are controlled by  a) the spin b) the magnetic field c) the ionization state of helium d) the gravitational...

T/F A supernova can be as bright as its entire host galaxy

T/F A supernova can be as bright as its entire host galaxy Answer: Tr...

A low-mass star might become a supernova if and only if

A low-mass star might become a supernova if and only if a) it is in a closer binary system b) it is really cool c) it is really dense d) it has a...

Suppose an atom has energy levels at 1, 3, 4, and 4.3. Which of the following is not a possible energy for an emitted photon?

Suppose an atom has energy levels at 1, 3, 4, and 4.3. Which of the following is not a possible energy for an emitted photon? a) 2 b) 1 c) 1.3 d)...

Most stars are

Most stars are a) cool and low-luminosity b) hot and low-luminosity c) cool and high-luminosity d) hot and high-luminosity Answer: ...

Two stars have equal luminosities, but star A has a much larger radius than star B. What can you say about these two stars?

Two stars have equal luminosities, but star A has a much larger radius than star B. What can you say about these two stars? a) Star A is hotter than...

The solar neutrino problem pointed to a fundamental gap in our knowledge of

The solar neutrino problem pointed to a fundamental gap in our knowledge of  a) nuclear fusion b) neutrinos c) hydrostatic equilibrium d magnetic...

In the proton-proton chain, four hydrogen nuclei are converted to a helium nucleus. This does not happen spontaneously on Earth because the process requires

In the proton-proton chain, four hydrogen nuclei are converted to a helium nucleus. This does not happen spontaneously on Earth because the process...

T/F Sun spots can be comparable in size to the Earth.

T/F Sun spots can be comparable in size to the Earth. Answer: Tr...

T/F Neutrinos make it out of the Sun faster than photons.

T/F Neutrinos make it out of the Sun faster than photons. Answer: Tr...

T/F An atom can emit or absorb a photon of any wavelength.

T/F An atom can emit or absorb a photon of any wavelength. Answer: Fal...

T/F The brightness of a star in the sky tells you its luminosity.

T/F The brightness of a star in the sky tells you its luminosity. Answer: Fal...

T/F Red Stars have cooler surfaces than blue stars.

T/F Red Stars have cooler surfaces than blue stars. Answer: Tr...

If the wavelength of a beam of light were halved, how would that affect the frequency?

If the wavelength of a beam of light were halved, how would that affect the frequency? a) the frequency would be four times larger b) the frequency...

The amplitude of light is:

The amplitude of light is: a) its color b) the frequency c) the speed d) the intensity Answer: ...

Lights act like (choose all that apply):

Lights act like (choose all that apply): a) a wave, always b) a particle, always c) both a wave and particle d) neither a wave nor a particle Answer:...

Gamma ray telescopes are placed in space because:

Gamma ray telescopes are placed in space because: a) gamma rays are too fast to be seen by stationary telescopes b)gamma rays do not like the atmosphere c)...

Astronomers put telescopes in space be cause:

Astronomers put telescopes in space be cause: a) they can b) avoid atmospheric effects c) to get closer to the stars d) improve quantum efficiency Answer:...

Light in the lowest energy end of the electromagnetic spectrum is in the _____ region.

Light in the lowest energy end of the electromagnetic spectrum is in the _____ region. a)visible b)gamma ray c) ultraviolet d)radio Answer:...

A CCD camera is a better astronomical detector than the human eye because (choose all that apply):

A CCD camera is a better astronomical detector than the human eye because (choose all that apply): a) It's awesome b) chromatic aberration is minimized c)...