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The main way astronomers determine the physical and chemical properties of an object in the distant universe is through
Lymphocytes
A subtype of white blood cells that play an integral role in the body's immune response.
Carcinogens
Substances that are known to cause cancer in living tissue.
Serotonin
A neurotransmitter that plays a role in mood regulation, digestion, sleep, and other bodily functions.
Sympathetic Nervous System
Part of the autonomic nervous system that prepares the body for quick action in emergencies; "fight or flight" response.
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