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Explain why a galaxy can collapse to a much smaller size than its dark matter halo.
Child-Directed Programs
Educational or recreational activities designed with the specific interests and developmental needs of children in mind.
Academic Instruction
The process of teaching specific knowledge or skills in an educational setting, typically carried out by a teacher or instructor.
Social Smile
A smile that emerges in response to seeing familiar people; occurs in an infant between 6 and 10 weeks after birth.
Milestone
A significant point in development or progress.
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