Horsehead Nebula @Desc@The Horsehead Nebula Is a Dark Nebula Making Part of the Much Larger Orion Molecular Cloud Complex

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Horsehead Nebula @desc@The Horsehead Nebula is a dark nebula making part of the much larger Orion Molecular Cloud Complex. First inspect the visual image: Why is it dark? Then load the near-infrared and the far-infrared maps. What do you see in each of them? Why? Cygnus OB2 @desc@Cygnus OB2 is an association of young massive stars. Look at the visual image: Can you see any evidences of the presence of ISM here? How would check this? W40 @desc@Check the optical image first. Do you see any evidences of the presence of ISM in this region? Now inspect it in the near-infrared. What is hidden within the dust? NGC 1333 @desc@A mere 1,000 light-years distant, the NGC 1333 region lies on the edge of the large Perseus Molecular Cloud. Looking at the optical image, how would you classify this region? What do you see in the near and far-infrared? Now focus on the bright blue star in the center of the nebula. How is this star interacting with the dust? Sgr A* @desc@This is the region in the center of our Galaxy (you will need to zoom out to a field of at least 12 degrees to fully appreciate it). How does this region look like in the optical? Make a guess: What do you expect to find if you observe it in the near and far-infrared? M31 @desc@M31, the Andromeda Galaxy, is one of the nearest galaxies and the one of the largest member of the Local Group of galaxies, together with our own Galaxy, the Milky Way. Compare the observations of this galaxy in the optical and infrared. Do you think M31 is rich in gas and dust? Where is this ISM mostly located within the galaxy?.

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A Horse of a Different Color
A Horse of a National Aeronautics and Different Color Space Administration A Horse of a Different Color To celebrate the 23rd anniversary of the Hubble Space Telescope, NASA released a new view of the Horsehead Nebula that provides an intriguing astronomical variation on the phrase, “a horse of a different color.” The Horsehead Nebula, also known as Barnard 33, was first recorded in 1888 by Williamina Fleming at the Harvard College Observatory. Visible-light images show a black silhouette, a “dark nebula,” that resembles a horse’s head. Dark nebulae are generally most noticeable because they block the light from background stars. Two views of Horsehead Nebula To see deeper into dark nebulae, astronomers use infrared These two images reveal different views of the Horsehead Nebula. The visible-light image on the left was taken by a ground-based light. Hubble’s infrared image of the Horsehead transforms telescope. The near-infrared image on the right was taken by the the dark nebula into a softly glowing landscape. The image Hubble Space Telescope. reveals more structure and detail in the clouds. In the image at left, the gas around the Horsehead Nebula shines Many parts of the Horsehead Nebula are still opaque at infrared a bright pink, in contrast to the darkness of the Horsehead itself. This pink glow occurs along the edge of the dark cloud and is wavelengths, showing that the gas is dense and cold. Within created by the bright star, Sigma Orionis, above the Horsehead, such cold and dense clouds are regions where stars are born.
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Horsehead Nebula, in Infrared Light, from Hubble
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[CII] 158M Emission from L1630 in Orion B
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Aromatic Emission from the Ionised Mane of the Horsehead Nebula
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A Horse of a Different Color
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