Exam 12: The Milky Way Galaxy

Regions of compression that move at their own speed in the disk and are outlined by the spiral arms are _____________.

The relative abundance of chemical elements are shown by atomic mass number. Which is/are the metal(s)

The center of our galaxy lies in the direction of the constellation of

Astronomers before Shapely underestimated the size of the Milky Way galaxy because they lacked telescopes.

Stars are eternal and unchanging in your lifetime but not over a star's lifetime

Which pulsate faster

The ____________________ hypothesis suggests that the Milky Way galaxy formed from a single cloud that flattened into a disk.

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

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

CO observations of the galaxy reveal

The relative abundance of chemical elements are shown by atomic mass number. Of those shown, which is the most abundant

What evidence do we have that the center of our galaxy is a powerful source of energy and a supermassive black hole

Pulsating variable stars are useful in determining

in the following graph, what does 5.36634 indicate according to your text

The disk of our galaxy consists of

As viewed edge-on, we can see all the spurs and branches off the arms of the Milky Way galaxy.

Younger stars have more heavy elements because

The Sun will one day pass through the instability strip and become a variable star.

-Which of the above shown variable types is brightest

How does the density wave theory explain the presence of young stars in the spiral arms