Astronomical Imaging: Overview. When you think of a clear, dark night sky, what do you think of? The human visual system is fine-tuned to focus, detect, & process (= image) the particular wavelengths where the Sun emits most of its energy
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This is approximately what you can see with your unaided eye when you look at Orion on a clear night
(a red supergiant)
(a blue supergiant)
Radio WavesMultiwavelength astronomy
Also note that stars are only one ingredient in a galaxy!
Images from NASA
The constellation of Orion
The Orion Nebula
(Hubble Space Telescope optical)
Orion Nebula region
left: optical (HST); center: infrared (2MASS); right: Xray (Chandra)