Reflection Nebulae: Reflection Nebula, Ic 5146, Ic 405, Ngc 1435, Iris Nebula, Mcneils Nebula, Messier 78, Ngc 7129, Ngc 1931 Books LLC

ISBN: 9781157340157

Published: May 29th 2010

Paperback

52 pages


Description

Reflection Nebulae: Reflection Nebula, Ic 5146, Ic 405, Ngc 1435, Iris Nebula, Mcneils Nebula, Messier 78, Ngc 7129, Ngc 1931  by  Books LLC

Reflection Nebulae: Reflection Nebula, Ic 5146, Ic 405, Ngc 1435, Iris Nebula, Mcneils Nebula, Messier 78, Ngc 7129, Ngc 1931 by Books LLC
May 29th 2010 | Paperback | PDF, EPUB, FB2, DjVu, audiobook, mp3, RTF | 52 pages | ISBN: 9781157340157 | 5.37 Mb

Chapters: Reflection Nebula, Ic 5146, Ic 405, Ngc 1435, Iris Nebula, Mcneils Nebula, Messier 78, Ngc 7129, Ngc 1931, List of Diffuse Nebulae, Ngc 2023, Ngc 1333, Ngc 1999, Ngc 1973, Ngc 1975 and Ngc 1977, Ic 444, Ngc 2170, Ngc 1990, Ic 447, Ic 4592,MoreChapters: Reflection Nebula, Ic 5146, Ic 405, Ngc 1435, Iris Nebula, Mcneils Nebula, Messier 78, Ngc 7129, Ngc 1931, List of Diffuse Nebulae, Ngc 2023, Ngc 1333, Ngc 1999, Ngc 1973, Ngc 1975 and Ngc 1977, Ic 444, Ngc 2170, Ngc 1990, Ic 447, Ic 4592, Variable Nebula.

Source: Wikipedia. Pages: 51. Not illustrated. Free updates online. Purchase includes a free trial membership in the publishers book club where you can select from more than a million books without charge. Excerpt: In Astronomy, reflection nebulae are clouds of dust which are simply reflecting the light of a nearby star or stars.

The energy from the nearby star, or stars, is insufficient to ionize the gas of the nebula to create an emission nebula, but is enough to give sufficient scattering to make the dust visible. Thus, the frequency spectrum shown by reflection nebulae is similar to that of the illuminating stars.

Among the microscopic particles responsible for the scattering are carbon compounds (e. g. diamond dust) and compounds of other elements such as iron and nickel. The latter two are often aligned with the galactic magnetic field and cause the scattered light to be slightly polarized (Kaler, 1997). Edwin Hubble distinguished between the emission and reflection nebulae in 1922. Reflection nebulae are usually blue because the scattering is more efficient for blue light than red (this is the same scattering process that gives us blue skies and red sunsets).

Reflection nebulae and emission nebulae are often seen together and are sometimes both referred to as diffuse nebulae. An example of this is the Orion Nebula. Some 500 reflection nebulae are known. Among the nicest of the reflection nebulae are those surrounding the stars of the Pleiades. A blue reflection nebula can also be seen in the same area of the sky as the Trifid Nebula. The giant star Antares, which is very red (spectral class M1), is surrounded by a large, red reflection nebula.

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