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  2. Globular cluster - Wikipedia

    en.wikipedia.org/wiki/Globular_cluster

    The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...

  3. Star cluster - Wikipedia

    en.wikipedia.org/wiki/Star_cluster

    Messier 68, a loose globular cluster whose constituent stars span a volume of space more than a hundred light-years across. In 2005, astronomers discovered a new type of star cluster in the Andromeda Galaxy, which is, in several ways, very similar to globular clusters although less dense.

  4. Cosmic distance ladder - Wikipedia

    en.wikipedia.org/wiki/Cosmic_distance_ladder

    Moving cluster parallax is a technique where the motions of individual stars in a nearby star cluster can be used to find the distance to the cluster. Only open clusters are near enough for this technique to be useful.

  5. Messier 4 - Wikipedia

    en.wikipedia.org/wiki/Messier_4

    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. [9] It was the first globular cluster in which individual stars were resolved. [9]

  6. Palomar 5 - Wikipedia

    en.wikipedia.org/wiki/Palomar_5

    There is a process of disruption acting on this cluster because of the gravitation of the Milky Way – in fact there are many stars leaving this cluster in the form of a stellar stream. The stream has a mass of 5000 solar masses and is 30,000 light years long. [6] The cluster is currently 60.6 kly (18.6 kpc) from the Galactic Center.

  7. Messier 3 - Wikipedia

    en.wikipedia.org/wiki/Messier_3

    It contains 274 known variable stars, by far the most found in any globular cluster. These include 133 RR Lyrae variables , of which about a third display the Blazhko effect of long-period modulation.

  8. Messier 5 - Wikipedia

    en.wikipedia.org/wiki/Messier_5

    One hundred and five stars in M5 are known to be variable in brightness, 97 of them belonging to the RR Lyrae type. [11] RR Lyrae stars, sometimes referred to as "Cluster Variables", are somewhat similar to Cepheid type variables and as such can be used as a tool to measure distances in outer space since the relation between their luminosities and periods are well known.

  9. Messier 13 - Wikipedia

    en.wikipedia.org/wiki/Messier_13

    The brightest star in the cluster is a red giant, the variable star V11, also known as V1554 Herculis, [16] with an apparent visual magnitude of 11.95. M13 is 22,200 to 25,000 light-years away from Earth , [ 9 ] and the globular cluster is one of over one hundred that orbit the center of the Milky Way.