0. Star Formation. 0. Giant Molecular Clouds. Barnard 68. Infrared. Visible. Star formation ← collapse of the cores of giant molecular clouds : Dark, cold, dense clouds obscuring the light of stars behind them . 0. Parameters of Giant Molecular Clouds. Size: r ~ 50 pc.
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Herbig Haro Object HH34
Herbig Haro Object HH30
The 4 trapezium stars: Brightest, very young (less than 2 million years old) stars in the central region of the Orion nebula
Only one of the trapezium stars is hot enough to ionize hydrogen in the Orion nebula
Infrared image: ~ 50 very young, cool, low-mass stars
X-ray image: ~ 1000 very young, hot stars
The Orion Nebula
Kleinmann-Low nebula (KL): Cluster of cool, young protostars detectable only in the infrared
The Becklin-Neugebauer Object (BN): Hot star, just reaching the main sequence
Spectral types of the trapezium stars
Visual image of the Orion Nebula
Protostars with protoplanetary disks