Exam 25: Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

When spiral galaxies do collide,the impact is greatest on their:

What evidence has Chandra found to contradict the hypothesis that black holes merge during galaxy collisions?

Active galaxies are having their central engines temporarily fed by what occurrence?

A great advantage of using ________ to map the universe is that it detects distributions of both normal and dark matter.

The distance between adjacent galaxies in a typical cluster is about ________ times the size of a typical galaxy.

Why are supermassive galaxies often found at the cores of rich galaxy clusters?

Explain the significance of the Lyman Alpha Forest in studying the universe on the grandest of scales.

As we look at larger and larger scales in the universe,we find:

Distant galaxies tend to be much bluer than those nearby.

Dark matter does not affect galaxy collisions.

Why would galaxies colliding in a small cluster tend to stick together,while galaxies in a large cluster tend to pass through each other?

A large cluster's mass can be over a thousand times that of our Galaxy.

Some quasars show absorption spectra with a smaller redshift than their emission spectra; this indicates that:

Astronomer's believe that a spiral galaxy may form:

A merger between a small elliptical galaxy and a large spiral galaxy will most likely result in:

Galaxies contain at most one supermassive black hole.

How can some mergers activate spirals,and others destroy them?

Gas that has never been cycled through a galaxy or a star is said to be ________.

The cosmological principle calls for the distribution of galaxies to be homogeneous.On the large scale,is this true?

That we can see two images of the same quasar is due to a(n)________ lens formed by a massive galaxy lying in front of the quasar.