Exam 16: Our Galaxy: The Milky Way

The coldest molecular clouds in our galaxy have temperatures of approximately 1000 K.

In the interstellar medium,molecules survive only in regions with:

The Milky Way is classified as an __________ galaxy.

Because of the ages of globular clusters in the Milky Way,we think our galaxy's early formation history was characterized by:

Which of the following is responsible for heating the bulk of the very hot intercloud gas?

There is a 10⁹ M _$\odot$ black hole at the center of the Milky Way that is rapidly accreting stars and gas.

Warm ionized gas in the interstellar medium appears __________ when imaged in the optical region of the electromagnetic spectrum.

Every open star cluster in the Milky Way is younger than even the youngest globular cluster.

What is ripping apart the Sagittarius dwarf spheroidal galaxy?

The only effect of interstellar dust is that it makes objects appear redder than they really are.

Dust reddens starlight because:

A typical molecular cloud has a temperature of approximately:

Our galaxy is a typical barred spiral galaxy.

Dust appears dark in __________ wavelengths and bright in __________ wavelengths.

Molecular cloud cores are places where you might find:

There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters.

The average density of the interstellar medium is many times less dense than the best vacuum on Earth.

Describe a scale model of the disk of the Milky Way using a scale in which 1 cm = 1,000 light-years.Note that the diameter of the disk is approximately 100,000 light-years,the thickness of young stars is 500 light-years,and the thickness of the older stars is 4,000 light-years.

The chemical composition of a star's atmosphere tells us:

Neutral hydrogen atoms are found only inside dense clouds where they are shielded from stellar radiation.