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  1. Wikipedia
    https://en.wikipedia.org › wiki

    Messier 4 - Wikipedia

    • Messier 4 or M4 (also known as NGC 6121 or the Spider Globular Cluster) is a globular cluster in the constellation of Scorpius. It was discovered by Philippe Loys de Chéseaux in 1745 and catalogued by Charles Messier in 1764. It was the first globular cluster in which individual stars were resolved. 展开

    Visibility

    M4 is conspicuous in even the smallest of telescopes as a fuzzy ball of light. It appears about the same size as the 展开

    Characteristics

    M4 is a rather loosely concentrated cluster of class IX and measures 75 light-years across. It features a characteristic "bar" structure across its core, visible to moderate sized telescopes. The structure consists of 11th-… 展开

    分类IX
    星座天蝎座
    赤经16ʰ 23ᵐ 35.22ˢ
    赤纬–26° 31′ 32.7″
    Notable stars

    Photographs by the Hubble Space Telescope in 1995 found white dwarf stars in M4 that are among the oldest known stars in our galaxy; aged 13 billion years. One has been found to be a binary star with a pulsar companion, … 展开

    Spinthariscope analogy

    The view of Messier 4 through a good telescope was likened by Robert Burnham Jr. to that of hyperkinetic luminous alpha particles seen in a spinthariscope. 展开

    Central black hole

    In 2023, an analysis of Hubble Space Telescope and European Space Agency's Gaia spacecraft data from Messier 4 revealed an excess mass of roughly 800 solar masses in the center of this cluster, which appears t… 展开

    External links

    • M4, SEDS Messier pages
    • M4, Galactic Globular Clusters Database page
    • "Hubble Space Telescope Finds Stellar Graveyard". Hubble News Desk. 1995-08-28. Retrieved 2006-05-24.… 展开

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    目录
    Visibility
    Characteristics
    简要情况
    Notable stars
    Spinthariscope analogy
    Central black hole
    See also
     
  1. Messier 4
    • 根据 3 个来源
    Messier 4 (M4, NGC6121) is a globular cluster that has a distance from Earth of 7,200.00 light years. It can be found in the constellation of Scorpius.

    Messier 4 Star Cluster Fact…

    universeguide.com
    Messier 4 (M4) is a bright globular cluster located in the southern constellation Scorpius. It lies at an approximate distance of 7,200 light years from Earth and has an apparent magnitude of 5.9.

    Messier 4 - Messier Objects

    messier-objects.com
    A Hubble Space Telescope image of the globular star cluster, Messier 4. The cluster is a dense collection of several hundred thousand stars.

    Globular Star Cluster M4 | E…

    esahubble.org
  2. Science Mission Directorate
    https://science.nasa.gov › ...

    Messier 4 - Science@NASA

    Messier 4, located in the constellation Scorpius, is a huge, spherical collection of stars known as a globular cluster. At just 5,500 light-years away, it is the closest globular cluster to Earth, making it a prime object for study.

  3. Messier Objects
    https://www.messier-objects.com

    Messier 4 - Messier Objects

  4. Universe Guide
    https://www.universeguide.com › cluster

    Messier 4 Star Cluster Facts (NGC 6121) - Universe Guide

  5. EarthSky
    https://earthsky.org › clusters-nebulae-galaxies

    Find M4: An easy to spot globular cluster near Antares - EarthSky

  7. Universe Today
    https://www.universetoday.com

    Messier 4 (M4) - The NGC 6121 Globular Cluster

    2016年2月22日 · The globular cluster is home to at least 43 known variable stars and to the first millisecond pulsar ever discovered inside a globular cluster. This neutron star – known as – is rotating (and...

  8. Science Mission Directorate
    https://science.nasa.gov › universe › sta…

    Star Clusters: Inside the Universe’s Stellar Collections

    2023年5月3日 · Star clusters can contain anywhere from as few as a dozen stars to upwards of millions, and those stars can be spread out over a few light-years to hundreds of light-years. There are three different types of star …

  9. HubbleSite.org
    https://hubblesite.org › contents › media › images

    Globular Cluster Messier 4 (M4) - HubbleSite

  10. ESA/Hubble
    https://esahubble.org › images

    Globular Star Cluster M4 | ESA/Hubble

  11. Center for Astrophysics
    https://pweb.cfa.harvard.edu › news

    Binary Stars in the Globular Cluster Messier 4 | Center for ...