FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 12: The Milky Way Galaxy

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 31

Multiple Choice

Review LaterAdd Note

Review Later

In which direction is the above spiral galaxy rotating and which color best represents where the gas is being compressed by the spiral density wave?

A) clockwise, blue
B) counter-clockwise, pink
C) clockwise, pink
D) counter-clockwise, blue

Correct Answer

verified

Show Answer

Question 32

Multiple Choice

Review LaterAdd Note

Review Later

Which stellar population has highly elliptical orbits?

A) Pop I extreme
B) Pop I intermediate
C) Pop II intermediate
D) Pop II extreme

Correct Answer

verified

Show Answer

Question 33

Short Answer

Review LaterAdd Note

The ____________________ of the galaxy contains population I stars, open clusters, and gas clouds.

​ What is the difference between a population I star and a population II star?

Population II stars contain more metals than Population I stars.

Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?

The rapid rotation in the outer disk suggests that our galaxy is more massive than previously thought.

The traditional "top-down" hypothesis of the formation of our galaxy cannot explain

Radio maps of the spiral arms of our galaxy

The Sun is located near a spiral arm.

Which of the above shown variable types is brightest?

Discuss how astronomers know that our galaxy contains spiral arms in its disk.

Sgr A* is believed to be the center of the Milky Way galaxy because I. it lies in the general direction of the center of the galaxy based on observations of globular clusters in the plane of the Milky Way. II. long-wavelength dust-penetrating images show it to be a region crowded with stars. III. orbits of stars around it indicate a mass several million times that of the Sun within a volume a few light hours in size. IV. radio observations show it is a concentrated source at the center of swirling clouds of gas.

Getting a cold is like building the chemical elements in nucleosynthesis.

​ M dwarf main-sequence stars pass through the instability strip as shown above.

___________ in other galaxies should contain luminous O and B stars if they are like the Milky Way.

The _________________ hypothesis includes mergers with smaller galaxies and infalling gas to the standard formation of the Milky Way galaxy.

Describe the central bulge of our galaxy.

More massive stars are _________ luminous and __________ than less massive stars, thus they pulsate _____________.

The spherical component is the __________.