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Why are Cepheid variables so important to the study of the Milky Way Galaxy?
Suprachiasmatic Nucleus
A small region in the brain's hypothalamus responsible for controlling circadian rhythms.
Biological Clock
An innate mechanism that controls the physiological activities of an organism, such as sleep cycles, puberty, and aging.
Hypothalamus
A small but crucial part of the brain located below the thalamus, responsible for regulating many bodily functions including hunger, thirst, sleep, and emotions.
SAD
Seasonal Affective Disorder, a type of depression that occurs at a certain time of the year, usually in winter.
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