How Did Edwin Hubble Measure the Distance to the Andromeda

question 123

Multiple Choice

How did Edwin Hubble measure the distance to the Andromeda Galaxy?

• A) He measured its parallax.
• B) He applied main-sequence fitting to star clusters in Andromeda.
• C) He applied the period-luminosity relation to Cepheid variables in Andromeda.
• D) He measured its redshift and applied Hubble's Law.
• E) He detected white dwarf supernovae in Andromeda.

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Definitions:

Economies of Scale

The savings businesses gain from operating at a larger scale, where the expense for each unit produced diminishes as the scale enlarges.

Short Run

A period in which at least one input in the production process is fixed, limiting the ability of a firm to adjust to changes in market demand.

Long Run

An economic term referring to a period during which all factors of production and costs are variable, allowing for full adjustment to changes.

Fixed Cost

Costs that do not change with the level of output or sales, such as rent or salaries.