Astronomy The Solar System

Physics & Astronomy

Quiz 20 :

The Milky Waya Normal Spiral Galaxy

Quiz 20 :

The Milky Waya Normal Spiral Galaxy

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By comparing globular clusters, you find that Cluster A's RR Lyrae stars are 100 times fainter than Cluster B's RR Lyrae stars.You know that both clusters have approximately the same chemical composition and age, and thus their RR Lyrae stars should have the same luminosities.Which is true about the clusters' distances?
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A

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The oldest stars in the galaxy are usually ________ in heavy elements because ________.
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B

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The Milky Way Galaxy is a(n) ________ galaxy.
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D

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The figure shown below immediately reveals that img
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The dark bands pictured in the figure below are strong evidence that the Milky Way is a(n) ________ galaxy. img
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The most distant globular clusters are found in which part of the galaxy?
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Spiral arms are
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Why is 21-cm radiation one of the best ways to map the spiral arms of the Milky Way?
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If dust is present between Earth and a distant globular cluster, the cluster will appear to be ________ than it is in reality.
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What type of standard candles did Shapley use to determine distances to globular clusters?
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The Sun is located approximately
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Any single star in the Milky Way Galaxy has the same elemental abundances as
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Somebody shows you the picture in the figure below and comments that it is the most recent photo of the Milky Way taken with an instrument aboard a spacecraft that has just recently left the boundaries of our home galaxy and is on its way to Andromeda. You would immediately react by saying: "This cannot be the Milky Way because img
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Halo stars near the Sun are distinguished from disk stars by what characteristics?
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Spiral arms are generated by
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Studying standard candles in globular clusters offered the first conclusive proof that our galaxy was much ________ than originally believed.
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The chemical composition of a star's atmosphere tells us
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In a star that has heavy-element abundance similar to the Sun's, what percentage of the star's mass is made up of elements heavier than hydrogen and helium?
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The Milky Way appears as ________ in the night sky because ________.
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Globular clusters, when compared with open clusters, generally
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