IC 1396: The Elephant’s Trunk Nebula

An ionized gas region located in the constellation Cepheus about 2,400 light years away from Earth; it is commonly called the Elephant’s Trunk nebula because of its appearance at visible light wavelengths, where there is a dark patch with a bright, sinuous rim. [image via]

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♥ 74262 Gif Nebula Elephant's Trunk Space Science → 10 months ago

According to Discovery News: “The Cat’s Paw Nebula (NGC 6334) is located approximately 5,500 light-years from Earth and is known to be an active star-forming region — the glow of which has been captured in stunning detail by a newly commissioned instrument on the Atacama Pathfinder Experiment, or APEX, telescope.

The instrument, called ArTeMiS, is a wide-field sub-millimeter-wavelength camera that is sensitive to the cool glow from the interstellar dust grains inside the nebula. In this image, the ArTeMiS observation (orange) has been superimposed over the top of an infrared VISTA telescope observation of the same region. Both APEX and VISTA are managed by the European Southern Observatory (ESO).”
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Serenity Nebula

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Originally, the word “nebula” referred to almost any extended astronomical object (other than planets and comets). The etymological root of “nebula” means “cloud”. As is usual in astronomy, the old terminology survives in modern usage in sometimes confusing ways. We sometimes use the word “nebula” to refer to galaxies, various types of star clusters and various kinds of interstellar dust/gas clouds. More strictly speaking, the word “nebula” should be reserved for gas and dust clouds and not for groups of stars.

By order in which they appear from top to bottom, left to right, here are the main types and some provided examples for visual reference:

Planetary Nebulae: Sh2-188

Planetary nebulae are shells of gas thrown out by some stars near the end of their lives. Our Sun will probably evolve a planetary nebula in about 5 billion years. They have nothing at all to do with planets; the terminology was invented because they often look a little like planets in small telescopes. A typical planetary nebula is less than one light-year across.

read more about the others 

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Trifid Nebula


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