page_title: Gaia Sausage
section_title: NGC 2808: Globular cluster or old core?
hierarchical_section_title: Gaia Sausage / Components / NGC 2808: Globular cluster or old core?
caption_attribution_description: This Hubble Space Telescope (HST) image of a dense swarm of stars shows the central region of the globular cluster NGC 2808 and its 3 generations of stars.
context_page_description: The Gaia Sausage is the remains of a dwarf galaxy, the Sausage Galaxy, or Gaia-Enceladus-Sausage, or Gaia-Enceladus, that merged with the Milky Way about 8–11 billion years ago. At least eight globular clusters were added to the Milky Way along with 50 billion solar masses of stars, gas and dark matter.
  The “Gaia Sausage” is so-called because of the characteristic sausage shape of the population in velocity space, a plot of radial versus proper motions of stars measured in the Gaia Mission. The stars that have merged with the Milky Way have orbits that are highly elongated. The outermost points of their orbits are around 20 kiloparsecs from the galactic centre at what is called the “halo break”. These stars had previously been seen in Hipparcos data and identified as originаting from an accreted galaxy.
context_section_description: NGC 2808 is another globular-like cluster of Sausage. This cluster is composed of three generations of stars, all born within 200 million years of the formation of the cluster.
  One theory to account for three generations of stars is that NGC 2808 is the former core of Sausage. This is also an explanation for the number of stars, more than a million, which is unusually large for a globular cluster.
caption: NGC 2808, possible old core of Gaia Sausage
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