Back Jong stervoorwerp Afrikaans أجسام نجمية فتية Arabic Oxetu estelar nuevu AST Cavan ulduzlar Azerbaijani Objecte estel·lar jove Catalan Mladý hvězdný objekt Czech Objeto estelar joven Spanish جسم ستارهای جوان Persian Jeune objet stellaire French Oggetto stellare giovane Italian
YSOs in the Rho Ophiuchi cloud complex
V1331 Cyg, a YSO surrounded by a reflection nebula
| Star formation |
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| Object classes |
| Theoretical concepts |
Young stellar object (YSO) denotes a star in its early stage of evolution. This class consists of two groups of objects: protostars and pre-main-sequence stars.
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