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  1. 直径100—180 kly(31—55 kpc
    薄恒星盘面厚度≈2 kly(0.6 kpc)

    Milky Way - Wikipedia

    • The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. The Milky Way is a barred spiral galaxy with a D25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 lig… 展开

    Etymology and mythology

    In the Babylonian epic poem Enūma Eliš, the Milky Way is created from the severed tail of the primeval salt water dragoness Tiamat, set in the sky by Marduk, the Babylonian national god, after slaying her. This story was once though… 展开

    Appearance

    The Milky Way is visible as a hazy band of white light, some 30° wide, arching the night sky. Although all the individual naked-eye stars in the entire sky are part of the Milky Way Galaxy, the term "Milky Way" is limited to this band of lig… 展开

    Astronomical history

    In Meteorologica, Aristotle (384–322 BC) states that the Greek philosophers Anaxagoras (c. 500–428 BC) and Democritus (460–370 BC) proposed that the Milky Way is the glow of stars not directly visible due to Ea… 展开

    Astrography

    The Sun is near the inner rim of the Orion Arm, within the Local Fluff of the Local Bubble, between the Radcliffe wave and Split linear structures (formerly Gould Belt). Based upon studies of stellar orbits around Sgr A* by Gilless… 展开

    Size and mass

    The Milky Way is one of the two largest galaxies in the Local Group (the other being the Andromeda Galaxy), although the size for its galactic disc and how much it defines the isophotal diameter is not well understood. It is … 展开

    Contents

    The Milky Way contains between 100 and 400 billion stars and at least that many planets. An exact figure would depend on counting the number of very-low-mass stars, which are difficult to detect, especially at dist… 展开

    Structure

    The Milky Way consists of a bar-shaped core region surrounded by a warped disk of gas, dust and stars. The mass distribution within the Milky Way closely resembles the type Sbc in the Hubble classification, which represents spira… 展开

     
  1. Milky Way Galaxy | Size, Definition, & Facts | Britannica

  2. Galactic Center - Wikipedia

  3. Milky Way - Simple English Wikipedia, the free encyclopedia

  4. The Milky Way Galaxy - Center for Astrophysics

  5. What is the Milky Way? It’s our home galaxy - EarthSky

    网页2024年1月1日 · Learn about the history, myths and science of the Milky Way, the galaxy we live in. See stunning photos of the starry band across the sky and the spiral arms of our galaxy.

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  7. The Milky Way Galaxy - NASA Science

  8. Milky Way galaxy: Facts about our cosmic …

    网页2023年4月18日 · The Milky Way galaxy is our cosmic home. A barred spiral galaxy stretching 100,000 light-years across. Here we explore our galactic neighborhood in more detail.

  9. NASA’s Webb Reveals New Features in Heart of Milky Way

  10. Milky Way Galaxy - Structure, Dynamics, Stars | Britannica

    网页5 天之前 · Milky Way Galaxy - Structure, Dynamics, Stars: The first reliable measurement of the size of the Galaxy was made in 1917 by American astronomer Harlow Shapley. He arrived at his size determination by …