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Galactic astronomy

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Title: Galactic astronomy  
Author: World Heritage Encyclopedia
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Subject: Astronomy, Astrometry, Science, Outline of space science, Theoretical astronomy
Publisher: World Heritage Encyclopedia

Galactic astronomy

Galactic astronomy is the study of our own Milky Way galaxy and all its contents. This is in contrast to extragalactic astronomy, which is the study of everything outside our galaxy, including all other galaxies.

Galactic astronomy should not be confused with galaxy formation and evolution, which is the general study of galaxies, their formation, structure, components, dynamics, interactions, and the range of forms they take.

Our own Milky Way galaxy, where our Solar System belongs, is in many ways the best studied galaxy, although important parts of it are obscured from view in visible wavelengths by regions of cosmic dust. The development of radio astronomy, infrared astronomy and submillimetre astronomy in the 20th Century allowed the gas and dust of the Milky Way to be mapped for the first time.


A standard set of subcategories is used by astronomical journals to split up the subject of Galactic Astronomy:

  1. abundances – the study of the location of elements heavier than helium
  2. bulge – the study of the bulge around the center of the Milky Way
  3. center – the study of the central region of the Milky Way
  4. disk – the study of the Milky Way disk (the plane upon which most galactic objects are aligned)
  5. evolution – the evolution of the Milky Way
  6. formation – the formation of the Milky Way
  7. fundamental parameters – the fundamental parameters of the Milky Way (mass, size etc.)
  8. globular clusters – globular clusters within the Milky Way
  9. halo – the large halo around the Milky Way
  10. kinematics and dynamics – the motions of stars and clusters
  11. nucleus – the region around the black hole at the center of the Milky Way (Sagittarius A*)
  12. open clusters and associations – open clusters and associations of stars
  13. solar neighbourhood – nearby stars
  14. stellar content – numbers and types of stars in the Milky Way
  15. structure – the structure (spiral arms etc.)

Stellar populations

Interstellar medium

See also

External links

  • Mapping the hydrogen gas in the Milky Way
  • Mapping the dust in the centre of the Milky Way
  • Search for Astronomy
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