Why Did Hubble Have to Rely on Cepheids to Find

question 109

Essay

Why did Hubble have to rely on Cepheids to find the distance to M31, unlike Shapley's use of RR Lyrae stars with the Milky Way?

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Definitions:

Farmland

Arable land used for the purpose of agricultural crops or livestock.

Comparative Advantage Theory

This theory suggests that countries should specialize in producing and exporting goods in which they have a lower opportunity cost than their trade partners.

Import

The practice of acquiring goods or services from outside a nation's borders for resale purposes.

Agricultural Goods

Products derived from agriculture, including crops and livestock, used for food, fuel, feed, and fiber.