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What was the implication of the observation by Edwin Hubble that the Cepheid variable stars he measured in the Andromeda "nebula" appeared to be very faint compared with what was expected?
Visuals
Elements that are designed to be seen, such as photographs, charts, and diagrams, used to communicate information or ideas.
Primary Aspects
Fundamental elements or characteristics that are central to understanding or analyzing a subject or issue.
Area Chart
A type of graph that represents quantified values as areas under a line, often used to track changes over time.
Construction
The process of building or assembling infrastructure, buildings, or other physical structures from a design, involving various trades and materials.
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