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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy


A) He determined the proper motion of globular clusters in the outer disk of the galaxy.
B) He found the distances to individual variables free floating in the halo.
C) He found the distances to open clusters found throughout the disk of the galaxy.
D) He found the distances to globular clusters distributed about the center of the galaxy.

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

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How is the age of the galaxy determined


A) measuring the metallicity of Population II stars
B) finding the turnoff point in the H-R diagram of globular clusters
C) from the motion of stars in the galactic halo
D) counting the number of open clusters in the spiral arms

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The Milky Way galaxy is an example of a grand-design galaxy.

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Which of the following is not a characteristic of the stars of the disk component of our galaxy


A) circular orbits
B) randomly inclined orbits
C) higher metal abundance
D) young stars
E) star-formation regions

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


A) Henrietta Leavitt
B) Edwin Hubble
C) John Glenn
D) Carl Sagan
E) Harlow Shapley

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-What is the orientation of the galaxy shown above relative to Earth A) face-on B) edge-on C) not quite edge-on D) not quite face-on -What is the orientation of the galaxy shown above relative to Earth


A) face-on
B) edge-on
C) not quite edge-on
D) not quite face-on

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Discuss how Harlow Shapley determined the structure of the Milky Way galaxy from his study of globular clusters.

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Shapley began his research on the star s...

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The above light curve shows a period that indicates ________________________. The above light curve shows a period that indicates ________________________. A) the star gets dimmer quickly and brighter gradually B) the star gets brighter quickly and dimmer gradually C) the binary star system has an elliptical orbit D) the system remains at constant absolute magnitude


A) the star gets dimmer quickly and brighter gradually
B) the star gets brighter quickly and dimmer gradually
C) the binary star system has an elliptical orbit
D) the system remains at constant absolute magnitude

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Figure 12-1 Figure 12-1 -Refer to Figure 12-1. A Type I Cepheid has been located in an open cluster. The period of the Cepheid variable is 30 days and the variables apparent visual magnitude, m, is 10. First, use 12-1 to estimate the absolute visual magnitude, M . Calculate the distance to this open cluster Hint: dpc = 10^{(m - M + 5) /5} A) 100 pc B) 10,000 pc C) 20 pc D) 300 pc E) 2500 pc -Refer to Figure 12-1. A Type I Cepheid has been located in an open cluster. The period of the Cepheid variable is 30 days and the variables apparent visual magnitude, m, is 10. First, use 12-1 to estimate the absolute visual magnitude, M . Calculate the distance to this open cluster Hint: dpc=10(m−M+5) /5dpc = 10^{(m - M + 5) /5}


A) 100 pc
B) 10,000 pc
C) 20 pc
D) 300 pc
E) 2500 pc

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The disk of the galaxy is older than the halo.

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The energy source at the center of our galaxy


A) is not visible at optical wavelengths.
B) produces X-rays.
C) must be less than 10 AU in diameter.
D) is not visible at optical wavelengths, produces X-rays, and must be less than 10 AU in diameter.
E) None of the other choices are correct.

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Spiral tracers tend to be old, luminous stars.

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Why are Cepheid variable stars important in our study of the Milky Way galaxy

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They can be used to calibrate ...

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

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Population I stars are metal rich, conta...

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Why does the average chemical composition of stars now forming differ from that of older stars

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The first stars formed from gas that was...

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Where are the Large Magellanic Cloud and Small Magellanic Cloud located


A) in the spiral arms
B) in the disk
C) in the bulge
D) None of the other choices are correct.

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