a: solar system ~
b: single family
What:
"A solar system is like a single family, including the people, their pets, and their belongings. A star cluster is like an apartment building: lots of families living in one big building, each family being its own solar system. Just like not all families live in apartment buildings, not all solar systems are in star clusters. A galaxy is like a city -- a large collection of families and apartment buildings."
Useful?
Writer: Not Stated
LCC:
Where:
Date: Oct 23 2016 11:00 AM
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