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  1. Nebula - Wikipedia

    • Objects named nebulae belong to four major groups. Before their nature was understood, galaxies ("spiral nebulae") and star clusters too distant to be resolved as stars were also classified as nebulae, but no longer are. H II regions, large diffuse nebulae containing ionized hydrogen; Planetary nebulae; Supernova remnants (e.g., Crab Nebula ...… See more

    Overview

    A nebula (Latin for 'cloud, fog'; pl.: nebulae, or nebulas ) is a distinct luminescent part of interstellar medium, which can consist of ionized, neutral, or molecular hydrogen and also cosmic dust. Nebulae are often star-forming reg… See more

    Observational history

    Around 150 AD, Ptolemy recorded, in books VII–VIII of his Almagest, five stars that appeared nebulous. He also noted a region of nebulosity between the constellations Ursa Major and Leo that was not associated with any … See more

    Formation

    There are a variety of formation mechanisms for the different types of nebulae. Some nebulae form from gas that is already in the interstellar medium while others are produced by stars. Examples of the former … See more

     
  1. Bokep

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