The Orion Nebula from HST. Orion stars from the VLT. 1 Ori C. Orion Trapezium from HST. Orion visible + radio (visible = HST, radio = VLA + GBT). Orion HII region ionization front map (O’Dell 2001). Schematic drawing of Orion, O’Dell+ 2008.
1 Ori C Orion Trapezium from HST
Orion bar, in optical (HST) and through a narrow-band 3.29 m filter, showing PAH emission
Orion bar in vibrationally-excited H2 (red), CO (blue), and PAH emission (green) (Tielens+ 1993)