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      "statement": "# Hubble: a photographic classification of galaxies\n\nHubble organized extragalactic systems by photographic structure: elliptical images, normal and barred spirals, and irregular forms. The 1926 paper details a morphological classification developed from earlier photographs.\n\nA consistent vocabulary makes large populations comparable. Spiral structure, bars and apparent ellipticity define different classes, with orientation and uncertain cases limiting interpretation. This observational scheme is a separate contribution from the later velocity–distance analysis.\n\n## Scientific scope\n\nThis is a descriptive classification of projected images. Early and late type names do not establish an evolutionary sequence. The paper's historical luminosity and distance assumptions are not adopted here.\n\n## People and systems\n\nEdwin Hubble\n\n\n\n## Original sources\n\n- [Edwin Hubble, Extra-galactic Nebulae, Astrophysical Journal 64 (1926), 321–369](https://www.gutenberg.org/cache/epub/68428/pg68428-images.html)\n",
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    "title": "Hubble: a photographic classification of galaxies",
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