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Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
Eating Disorders
Mental disorders characterized by abnormal or disturbed eating habits that negatively affect a person's physical and/or mental health.
Depression
A mental health disorder marked by persistent sadness or a lack of interest in activities, causing significant impairment in daily life.
Related
Having a connection or association with someone or something.
Serotonin Levels
The concentration of serotonin, a neurotransmitter that influences mood, appetite, and sleep, thought to be linked with depression when imbalanced.
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