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  2. Ebook - Wikipedia

    en.wikipedia.org/wiki/Ebook

    An ebook (short for electronic book), also known as an e-book or eBook, is a book publication made available in digital form, consisting of text, images, or both, readable on the flat-panel display of computers or other electronic devices.

  3. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_page

    The Omega Nebula is an H II region, a type of emission nebula, in the constellation Sagittarius.It was discovered by Jean-Philippe Loys de Cheseaux in 1745. Charles Messier catalogued it in 1764 as number 17 in his set of comet-like astronomical objects.