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Describe at least two things scientists have learned by sending spacecraft to comets, and why these could not be learned from ground-based observations.
Developmental Stage
A phase of life characterized by specific physical, psychological, or emotional features that individuals typically pass through as they age.
Middle Adulthood
A stage of life typically ranging from around 40 to 65 years old, characterized by stability, maturity, and increased focus on personal and professional achievements.
Older Adulthood
A stage of life generally considered to begin at the age of 65, characterized by retirement, transitioning lifestyles, and increased focus on health maintenance.
Adolescence
The transitional stage of physical and psychological development that occurs between childhood and adulthood.
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