A region of active star formation within molecular clouds where multiple protostars and young stars are being born simultaneously. These areas are characterized by dense gas, dust, and the presence of various stellar formation phenomena including jets, outflows, and embedded infrared sources.
From Latin 'stellaris' (of stars) and Middle English 'nurserie' (place for nurturing), the metaphorical term emerged in the mid-20th century as astronomers recognized regions where multiple stars form together. The biological analogy emphasizes the nurturing environment needed for stellar birth.
Stellar nurseries are like cosmic maternity wards where hundreds of stars can be born from the same giant cloud! The Orion Nebula alone has over 1,000 young stars packed into a region just 25 light-years across - that's like having 1,000 babies in an area the size of a small city.
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