Exam 17: Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

How do head- tail radio galaxies reveal their motion?

The total mass of a galaxy tends to be only slightly larger than the visible mass.

For nearby galaxies, determining the rotation curve allows us to calculate the mass.

The stability of clusters of galaxies suggests that there is between 10 and 100 times as much dark matter as visible in the galaxies.

The greater the mass of the foreground cluster of galaxies, the _ the warping of the images of the distant galaxies behind it.

Mergers between equally massive galaxies usually produce elliptical galaxies.

Most galaxies are isolated in space.

Explain the process of small irregular galaxies evolving into spirals and giant ellipticals.

Galactic collisions are believed to be commonplace.

Head- tail radio galaxies reveal their motion through the intergalactic gas with a tail- like structure.

In what way is the formation of a galaxy from a cloud the opposite of stellar formation?

images of galactic clusters reveal large amounts of hot, intracluster gas.

There are large amounts of superhot intergalactic matter.

In Hubble's Tuning Fork, mergers drive the arrow of time to the .

Why would spiral galaxies be less common now than in the early universe?

Galactic evolution is due to collisions between galaxies.

The seeds of protogalaxies were comparable in mass to the .

Giant elliptical galaxies may be the result of in the centers of rich clusters.

The greatest gravitational lensing is produced by the _ _ that lie in the centers of massive galaxies.

Clusters appear to have dark matter than their individual galaxies.