The Age of the Milky Way Galaxy Has Been Estimated

question 61

Multiple Choice

The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on

• A)observations of globular clusters.
• B)observations of open clusters.
• C)21-cm radiation from H I regions.
• D)the rotation curve of the galaxy.
• E)the energy produced by Sagittarius A*.

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