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

A red supergiant is observed in a globular cluster in another galaxy (located 150,000 light-years away). It is predicted, based on its mass and age of the star, that it will supernova in about10,000 years. Is this star still there?

According to their rotation curves, most spiral galaxies:

The Sloan Digital Sky Survey uses:

What is a galaxy's rotation curve? To which galaxies is it best applied, and what does it tell usabout the distribution of dark matter?

If the merger theory is correct, the brightest active galactic nuclei should:

Why do almost all active galaxies occur in clusters of galaxies?

A red supergiant is observed in a globular cluster in another galaxy (located 150,000 light-years away). It is predicted, based on its mass and age of the star, that it will supernova in about10,000 years. When will this supernova be visible on Earth?

Relate black holes in the early galaxies to quasars.

What is true of spiral galaxies?

From studies of the masses of individual galaxies and the masses of clusters of galaxies, it isnow apparent that up to ________ of the universe is composed of dark matter.

To what three types of modern survivors can the masses of the protogalactic blobs becompared?

For nearby spirals, their rotation curves help measure both light and dark matter.

Collisions between galaxies are thought to:

On average, the stars in elliptical galaxies are older than the stars in spiral galaxies.

On average, elliptical galaxies are much older than large spiral galaxies.

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

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

Voids contain about what percentage of the universe's mass?

Why do rich clusters of galaxies contain a larger fraction of ellipticals than poor clusters orgroups of galaxies?

Compared to the Milky Way, how many stars are contained in the most massive galaxies?