astronomy, galaxies, spiral galaxy, M 51, discovered 1845, by William Parsons, Earl of Rosse, (1800-1867), star, stars, heaven,

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astronomy, galaxies, spiral galaxy, M 51, discovered 1845, by William Parsons, Earl of Rosse, (1800-1867), star, stars, heaven, astronautics,

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Keywords: 51, 1845, astronautics, astronomy, discovered, earl, galaxies, galaxy, heaven, parsons, rosse, spiral, star, stars, william