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The first person to observe that our galaxy is disk-shaped was ______________.
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The first person to observe that our galaxy is disk-shaped was ______________.

In the 20th century, __________ used the distances and directions of many _________ clusters to map out the Milky Way and show that our solar system was not in the center. Part of the difficulty in observing the Galaxy is that we are in the main disk and there is a lot of ______ in the disk, obscuring our view. Today astronomers have observed the distant regions of the Galaxy and know that near the middle, stars are not confined to the disk but are distributed in __________.

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Subject: Astronomy, Science

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