Astronomy Chapter 23: The Milky Way Galaxy

The location of the Galactic Center was first found by Harlow Shapely with

Based on star counts, 100 years ago most astronomers thought:

It was the distribution of ____ that showed Harlow Shapely we were no where near the center of the Milky Way in the 1920s.

What is one of the differences between Cepheids and RR Lyrae variables?

The period-luminosity relation is critical in finding distances with

Which two classes of objects were critical to the Shapely-Curtiss Debate of 1920?

What is the correct description of the Sun's location within the Milky Way?

In structure, our Milky Way is most similar to

For what type of object is the period-luminosity relation used for determining distances?

The region on the H-R diagram where pulsating variables occur is called the:

The part of the Milky Way we are most familiar with is the:

All RR Lyrae stars have about the same:

The RR Lyrae stars all have periods of:

The period-luminosity relation was discovered in 1908 by:

Why was Herschel's strategy for mapping our Galaxy flawed?

A star in the instability strip of the H-R diagram would:

Which of the following are most massive and luminous?

The first attempt to map the Galaxy via star counts was done by:

Galactic disks appear blue because:

Harlow Shapely found the Milky Way was:

What perception of the Milky Way Galaxy did astronomers have in 1900?

Both RR Lyrae and Cepheid variable stars are stars that, when on the main sequence, were considered to be:

From the Sun, the distance to the Galactic Center is about:

Detailed measurements of the disk and central bulge region of our Galaxy suggest our Milky Way is a:

Matter belonging to the Galaxy can be traced out to ___ from the center.

In the formation of our Galaxy, the ___ formed first.

Star formation ceased first in the:

The "aspect ratio" of thickness to width of the galactic disk is about:

In the halo, we do NOT find:

From Earth the view of the Milky Way is a thin band of stars across the night sky. The part of the Milky Way galaxy that is described here is the:

Which is the correct description for the Sun's location in the Galaxy?

Which of these objects have NOT been found in the Galactic Halo?

The Galactic Year is the time for our solar system to orbit the Galaxy, it is about:

Which sequence of formation by age is correct, oldest to youngest?

Which of these is NOT typical of the Galaxy's spiral arms?

Most of the new star formation in the Galaxy is found in the:

The orbits of Population II stars have been compared to:

Most of the mass of the Milky Way seems to exist in the form of:

Density waves may explain:

Using an orbit size of 8kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to:

Which of the following is most like the rotation of stars in the disk of the Milky Way?

What observations suggest the mass of the Galaxy goes much farther out than its visible disk?

While yet unproven, the proposed WIMPS would be:

Between us and the Galactic Center, the Milky Way has a mass of:

What use are 21 cm radio waves to galactic astronomers?

Which method relies on the mass of a dark object revealing its presence?

These objects are no longer considered a good explanation for the dark matter in the halo.

The radio source ___ is located in a place consistent with the center of our Galaxy.

The leading explanation for the existence of spiral arms are:

What two observations allow us to calculate the Galaxy's mass?