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

A merger between two large galaxies of comparable size will most likely produce:

The peak of the quasar epoch was:

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

The last quasar probably died out a billion years ago, for none lie within a billion light-yearsof us.

Collisions between galaxies:

Dark matter does not affect galaxy collisions.

The pregalactic blobs had masses similar to:

A radio galaxy whose lobes are swept back as if forming a tail probably indicates that:

It is now believed the majority of mass for most galaxies lies in their dark halos.

Gravity lensing lets us map the distribution of both visible and dark matter.

The ________ phenomenon is an extremely energetic event which apparently occurs in thenuclei of massive galaxies during an early stage of their evolution.

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

A galaxy that was once a quasar is likely to:

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

According to the HST data, very distant (and early)galaxies tend to be:

The type of galaxy where we can track its motion through the intergalactic medium is a:

Astronomers think most galaxy interactions took place at redshifts of greater than 1 because:

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

Collisions between galaxies have little effect on the individual stars.

The energy radiated from a typical quasar requires that its black hole accrete about: