Exam 24: Galaxies: Building Blocks of the Universe

M-87, the giant elliptical at the heart of the Virgo Supercluster, shows a(n)________extending outward from its core, moving at relativistic velocities.

The Milky Way is often considered to be an intermediately wound, barred spiral, whichwould be type ________ according to Hubble.

Hubble's Law starts as a plot of recessional ________ versus distance to the galaxies.

Why does the Cepheid "standard candle" have limited usefulness beyond 20 Mpc?

How can the size of a quasar be measured?

The latest evidence from 2MASS suggests our own Milky Way is type SBb.

Synchrotron radiation produces a(n)________ spectrum.

In color photos, spirals typically have ________ arms with pink H II regions.

According to Hubble's Law, the greater a galaxy's redshift, the:

Which statement about the Local Group is FALSE?

The type of radiation coming from active nuclei due to electrons spiraling in very strongmagnetic fields at relativistic speeds is:

Why is the energy source for active nuclei like Seyferts thought to be compact?

An intermediately wound barred spiral galaxy would, in Hubble's system, be:

Type Sc are the dustiest of the galaxies.

Why is it that the quasars we see represent a time when the universe was younger?

The magnetic fields carried by jets coming from active galactic nuclei are generated by:

Almost all active galactic nuclei seem to be involved in ________ with neighbors.

In Hubble's classification, which type of galaxy has a small bulge and loose, widely spread,poorly defined spiral pattern?

The first hint that the universe might be expanding came from Vesto Slipher's work with thespectra of spiral nebulae in 1912.

Astronomers observe unobscured X-rays generated in active galactic nuclei.