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    The Beauty and Mystery of Spiral Galaxies
    The Beauty and Mystery of Spiral Galaxies
    Galaxies are huge collections of stars, gas, and dust that populate the universe. One of the most common and stunning types of galaxies is the spiral galaxy.
    Structure

    Spiral galaxies may consist of several distinct components:
    • A flat, rotating disc of stars and interstellar matter of which spiral arms are prominent components
    • A central stellar bulge of mainly older stars… See more

    Origin of the spiral structure

    The pioneer of studies of the rotation of the Galaxy and the formation of the spiral arms was Bertil Lindblad in 1925. He realized that the idea of stars arranged permanently in a spiral shape was untenable. Since the angular sp… See more

    Spiral nebula

    Before it was understood that spiral galaxies existed outside of our Milky Way galaxy, they were often referred to as spiral nebulae, due to Lord Rosse, whose telescope Leviathan was the first to reveal the spiral st… See more

    Milky Way

    The Milky Way was once considered an ordinary spiral galaxy. Astronomers first began to suspect that the Milky Way is a barred spiral galaxy in the 1960s. Their suspicions were confirmed by Spitzer Space Telescope observations … See more

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