Exam 17: Galaxies

The rotation curve of a galaxy is a graph showing the galaxy's speed of rotation at different distances from the center. The observed rotation curve in the outer parts of a typical large spiral galaxy

What is the typical temperature of the intergalactic gas in rich clusters of galaxies?

Which of these bodies is NOT one of the satellite galaxies that surround the Milky Way Galaxy?

What does a spiral galaxy look like when seen edge-on?

An astronomer studying a galaxy finds that its spectrum shows only old, low-mass, Population II stars, and photographs of the galaxy show little or no interstellar gas or dust. What kind of galaxy is this astronomer studying?

Which one of these occurrences has NOT been observed as evidence of colliding galaxies?

In this universe, one can consider four different regimes of space in which distances between objects might be changing as a result of the general expansion of the universe: (1) distances between different parts of Earth, (2) distances between planets in the solar system, (3) distances between stars in the Milky Way Galaxy, and (4) distances between superclusters of galaxies. In which of these regimes are the distances changing because of the universal expansion?

Which of these statements about galactic motions and interactions is MOST accurate?

What would happen if the Andromeda Galaxy (a spiral about the same size as the Milky Way Galaxy) collided with the Milky Way?

What is the Local Group?

Elliptical galaxies look far less impressive than spiral galaxies because

Consider a cluster of galaxies. What is increasing because of the Hubble flow?

Suppose an astronomer discovers a distant quasar whose recessional velocity is 1/3 the speed of light. If Hubble's constant is 73.5 km/s per Mpc, how far away is the quasar?

The primary evidence for the expanding universe concept is the

To an astronomer, what is a "standard candle"?

One of the consequences of the collision of two galaxies appears to be

If most of the mass of a galaxy is located near the center of the galaxy, then in the outer part of this galaxy the orbital speeds of stars must decrease with increasing distance from the center. This behavior would be equivalent to

The Hubble law, representing observations of distant objects in the universe, relates which two parameters?

The distance-measuring techniques, arranged in order of the distance for which they are MOST effective (from least to most) are

The largest range of sizes of galaxies is found in which class of galaxies?