The Milky Way

You would expect to find the least number of young O,B stars in the 

• nucleus

• disk

• halo

• spiral arm

The diameter of the disk of the Milky Way Galaxy is approximately _____.

• 10,000 ly

• 28,000 ly

• 50,000 ly

• 100,000 ly

Tags

NGSS.MS-ESS1-3

Suppose you observe a globular cluster located about 70,000 light-years from the center of our galaxy. This cluster is __________.

• within the central bulge of our galaxy

• far out in the halo of our galaxy

• so far away that it must be in another galaxy

• in the disk of our galaxy

Clouds of gas and dust that are currently giving birth to stars are found in _____.

• only the disk

• only the halo

• both the disk and halo

• only in the spheroid

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

• the motion of nearby stars
• the distribution of globular clusters and Cepheid variable stars
• the brightness of supernovae
• RR Lyrae variables in the globular clusters.

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

• The Sun is located in the Galactic Halo.
• The Sun is located in in the disk and about one-half a galactic radius from the center

• The Sun is located in the Andromeda Galaxy.
• The Sun is located at the center of the Milky Way.

Galactic disks appear blue because:

• Galactic disks appear blue due to the presence of dark matter.
• Galactic disks appear blue because they contain young, hot stars that emit blue light.
• Galactic disks appear blue as a result of gravitational lensing effects.
• Galactic disks appear blue because they are primarily composed of gas and dust.

The RR Lyrae stars all have periods of:

• 1 to 5 days
• 0.2 to 1 day
• 2 to 3 days
• 0.05 to 0.2 days

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

• Isaac Newton
• Galileo Galilei
• Albert Einstein
• William Herschel

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

• Emission Nebulae

• Black holes
• Globular Clusters

• Old stars