Why Were Cepheid Variables Essential to the Discovery of Galaxies

question 14

Essay

Why were Cepheid variables essential to the discovery of galaxies outside the Milky Way?

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Definitions:

Afferent Fibres

Nerve fibers that carry sensory information from the body's periphery towards the central nervous system.

Autonomic Fibres

Nerve fibers that are part of the autonomic nervous system, responsible for regulating involuntary body functions such as heart rate and digestion.

Efferent Fibres

Nerve fibers that carry impulses away from the central nervous system to effectors (such as muscles or glands), enabling actions and responses to sensory input.

Motor Fibres

Nerve fibers that transmit impulses from the brain or spinal cord to muscles or glands, thereby initiating movement or action.