Exam 13: The Galaxies

"Dark matter" is matter that gives out no observable radiation and is detected by its gravitational interaction alone.Some of our evidence for dark matter comes from all of the following EXCEPT ONE.Which is the exception?

Which two quantities are shown to be related to each other in Hubble's law?

Which statement CORRECTLY describes the rotation of the Milky Way Galaxy?

An intense radio source is found to coincide with a starlike object whose spectrum contains a pattern of intense emission lines in the visible range that matches that of the Lyman UV hydrogen spectral lines but is very redshifted.What is this object?

What is believed to be the origin of starburst galaxies?

A map of the Milky Way Galaxy deduced from radio observations of the 21-cm line emission from cool hydrogen gas and observations of spiral arm tracers such as giant molecular clouds reveals:

For which objects in the universe has the Hubble relation been shown to hold experimentally?

What atomic transition occurs in the atoms of hydrogen gas in the spiral arms of the Milky Way Galaxy to produce the 21-cm radio emission?

What is now considered to be the mechanism for the production of the double lobes of radio emission that appear on either side of many galaxies?

A particular galaxy appears round,with a nuclear region of uniform brightness and an outer region that is broken up into curved but fuzzy and poorly defined lanes of stars and light gas clouds.How would this galaxy be classified?

By 2004,the most distant galaxies astronomers were observing were how far away?

All quasars appear to be:

The highest recession velocities that have recently been detected for quasars are:

In 2004,a blazar of 10 billion solar masses was discovered at a distance of 12.5 billion ly.What was particularly intriguing about this discovery?

Which galaxy type contain little or no interstellar dust or gas?

Where in space would you look for a globular cluster?

The observation by Hubble that demonstrated for the first time that the Andromeda "nebula" was at a very large distance from the Sun and outside the Milky Way Galaxy was that:

Doppler measurements of the motions of stars in nearby spiral and barred galaxies indicate that:

The width (Doppler broadening)of the 21-cm line in a spiral galaxy is NOT related to which property of the galaxy?

Where is the solar system located in the Milky Way Galaxy?