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photo by Ernst Stratmann
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Interstellar dust
The Orion region is an interesting part of the universe. Astronomers begin their first observations here. The Horsehead Nebula (also known as Barnard 33 and IC434) is a dark nebula in the constellation Orion. The nebula is located in Old Alnitk, at the end of the Orion belt, and is part of the larger Orion molecular cloud complex. It is about 1,500 light-years from Earth. The Horsehead Nebula is one of the most famous nebulae in the sky. It is about five light years high. The interstellar dust is classified as Barnard 33. It is visible only because the dust covers the emission nebula IC 434. This object gives a fascinating picture to the observer. Objects are nice to see. It is nice to see with a telescope.
Reflection nebula
Contrasting blue reflection nebula NGC 2023 is visible. In this image, both Horsehead and NGC 2023 seem to be caught in beams of light shining. The beams are just internal reflections from bright star Sigma Orionis. The horse-head feature is dark object. It is an opaque dust cloud which lies in front of the bright emission nebula. Clouds has assumed a recognizable shape by chance. That will change in the years to come. After many thousands of years, the internal motions of the cloud will alter its appearance. The colors will stay the same, but the nebulae will change the look.
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Interstellar Exploration Vessel: A spaceship-like boat exploring the surface of an alien ocean, under a star-filled sky, with auroras reflected in the water, using a high-angle, wide shot. s 500 v 6.0 @Investors.Talk
What blue flower grows in this field of dark interstellar dust? The Iris Nebula. The striking blue color of the Iris Nebula is created by light from the bright star SAO 19158 reflecting off of a dense patch of normally dark dust. Not only is the star itself mostly blue, but blue light from the star is preferentially reflected by the dust -- the same affect that makes Earth's sky blue. The brown tint of the pervasive dust comes partly from photoluminescence -- dust converting ultraviolet radiation to red light. Cataloged as NGC 7023, the Iris Nebula is studied frequently because of the unusual prevalence there of Polycyclic Aromatic Hydrocarbons (PAHs), complex molecules that are also released on Earth during the incomplete combustion of wood fires. The bright blue portion of the Iris Nebula spans about six light years. The Iris Nebula, pictured here, lies about 1300 light years distant and can be found with a small telescope toward the constellation of Cepheus. via NASA ift.tt/2OwUoM8