Exam 14: Measuring Galaxies

If you found a galaxy with a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would the galaxy's recessional velocity be if the Hubble constant is 72 km/s/Mpc?

If the distance of a galaxy is 100 Mpc,what is its recessional velocity if the Hubble constant is 72 km/s/Mpc?

If you found a galaxy with a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 756.3 nm,what would be the galaxy's redshift?

What did Edwin Hubble study in the Andromeda Galaxy that proved it was an individual galaxy and not part of our own Milky Way?

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?

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 spectrum of a galaxy is observed to have a hydrogen emission line,normally found at 656.3 nm,with a measured wavelength of 856.3 nm.What is its distance if the Hubble constant is 72 km/s/Mpc?

The Hubble constant,H₀,represents:

Astronomers use galactic redshift as a measure of:

If we lived on a galaxy 1 billion light-years from our own,what would we see?

If the distance of a galaxy at a redshift z = 0.5 is 1,800 Mpc,what is H₀?

Which of the following galaxies can be found with a bar-like structure in them?

Stars that travel in the same direction around a concentration of mass are characteristic orbits found in:

Explain the connection between quasars and AGNs and their source of power.

Astronomers have known that galaxies are separate entities outside of our own for roughly the past:

What is the size of the region responsible for powering an AGN?

What accounts for the different types of observed AGNs?

Which of the following is NOT associated with the arms of a spiral galaxy?

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

What is a quasar?