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Which kind of telescope is shown?
Midlife Crisis
A stage of uncertainty and indecision brought about by the realization that life is finite.
Critical Mass
The minimum amount of fissile material needed to maintain a nuclear chain reaction or the minimum size or amount required for something to maintain or expand.
Extinction
The process through which a species, family, or larger group of organisms becomes permanently absent or dies out from the Earth.
Communal Professions
Occupations that are associated with relationships.
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