The broken-exponential radial structure and larger size of the Milky Way galaxy (2024)

The broken-exponential radial structure and larger size of the Milky Way galaxy (1) https://doi.org/10.1038/s41550-024-02315-7

Journal: Nature Astronomy, 2024

Publisher: Springer Science and Business Media LLC

Authors:

  1. Jianhui Lian
  2. Gail Zasowski
  3. Bingqiu Chen
  4. Julie Imig
  5. Tao Wang
  6. Nicholas Boardman
  7. Xiaowei Liu

Funders

  1. Yunnan University
  2. Yunnan Provincial Science and Technology Department

List of references

  1. van der Kruit, P. C. & Freeman, K. C. Galaxy disks. Annu. Rev. Astron. Astrophys. 49, 301–371 (2011).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (2) https://doi.org/10.1146/annurev-astro-083109-153241
  2. Bland-Hawthorn, J. & Gerhard, O. The Galaxy in context: structural, kinematic, and integrated properties. Annu. Rev. Astron. Astrophys. 54, 529–596 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (3) https://doi.org/10.1146/annurev-astro-081915-023441
  3. Bovy, J. et al. The spatial structure of mono-abundance sub-populations of the Milky Way disk. Astrophys. J. 753, 148 (2012).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (4) https://doi.org/10.1088/0004-637X/753/2/148
  4. Shen, J. & Zheng, X.-W. The bar and spiral arms in the Milky Way: structure and kinematics. Res. Astron. Astrophys. 20, 159 (2020).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (5) https://doi.org/10.1088/1674-4527/20/10/159
  5. Pohlen, M. & Trujillo, I. The structure of galactic disks. Studying late-type spiral galaxies using SDSS. Astron. Astrophys. 454, 759–772 (2006).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (6) https://doi.org/10.1051/0004-6361:20064883
  6. Zasowski, G. et al. Target selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE). Astron. J. 146, 81 (2013).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (7) https://doi.org/10.1088/0004-6256/146/4/81
  7. Majewski, S. R. et al. The Apache Point Observatory Galactic Evolution Experiment (APOGEE). Astron. J. 154, 94 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (8) https://doi.org/10.3847/1538-3881/aa784d
  8. Zasowski, G. et al. Target selection for the SDSS-IV APOGEE-2 Survey. Astron. J. 154, 198 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (9) https://doi.org/10.3847/1538-3881/aa8df9
  9. Beaton, R. L. et al. Final targeting strategy for the Sloan Digital Sky Survey IV Apache Point Observatory Galactic Evolution Experiment 2 north survey. Astron. J. 162, 302 (2021).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (10) https://doi.org/10.3847/1538-3881/ac260c
  10. Santana, F. A. et al. Final targeting strategy for the SDSS-IV APOGEE-2S survey. Astron. J. 162, 303 (2021).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (11) https://doi.org/10.3847/1538-3881/ac2cbc
  11. Jurić, M. et al. The Milky Way tomography with SDSS. I. Stellar number density distribution. Astrophys. J. 673, 864–914 (2008).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (12) https://doi.org/10.1086/523619
  12. Licquia, T. C. & Newman, J. A. Improved estimates of the Milky Way’s stellar mass and star formation rate from hierarchical Bayesian meta-analysis. Astrophys. J. 806, 96 (2015).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (13) https://doi.org/10.1088/0004-637X/806/1/96
  13. Boardman, N. et al. Milky Way analogues in MaNGA: multiparameter hom*ogeneity and comparison to the Milky Way. Mon. Not. R. Astron. Soc. 491, 3672–3701 (2020).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (14) https://doi.org/10.1093/mnras/stz3126
  14. Bovy, J. et al. The stellar population structure of the Galactic disk. Astrophys. J. 823, 30 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (15) https://doi.org/10.3847/0004-637X/823/1/30
  15. Mackereth, J. T. et al. The age–metallicity structure of the Milky Way disc using APOGEE. Mon. Not. R. Astron. Soc. 471, 3057–3078 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (16) https://doi.org/10.1093/mnras/stx1774
  16. Gaia Collaboration. et al. The Gaia mission. Astron. Astrophys. 595, A1 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (17) https://doi.org/10.1051/0004-6361/201629272
  17. Gaia Collaboration. et al. Gaia Early Data Release 3. Summary of the contents and survey properties. Astron. Astrophys. 649, A1 (2021).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (18) https://doi.org/10.1051/0004-6361/202039657
  18. Rojas-Arriagada, A. et al. The bimodal [Mg/Fe] versus [Fe/H] bulge sequence as revealed by APOGEE DR14. Astron. Astrophys. 626, A16 (2019).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (19) https://doi.org/10.1051/0004-6361/201834126
  19. Lian, J. et al. The Milky Way tomography with APOGEE: intrinsic density distribution and structure of mono-abundance populations. Mon. Not. R. Astron. Soc. 513, 4130–4151 (2022).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (20) https://doi.org/10.1093/mnras/stac1151
  20. Cantat-Gaudin, T. et al. Uniting Gaia and APOGEE to unveil the cosmic chemistry of the Milky Way disc. Astron. Astrophys. 683, A128 (2024).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (21) https://doi.org/10.1051/0004-6361/202348018
  21. Xiang, M. et al. Stellar mass distribution and star formation history of the Galactic disk revealed by mono-age stellar populations from LAMOST. Astrophys. J. Suppl. Ser. 237, 33 (2018).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (22) https://doi.org/10.3847/1538-4365/aad237
  22. Erwin, P., Pohlen, M. & Beckman, J. E. The outer disks of early-type galaxies. I. Surface-brightness profiles of barred galaxies. Astron. J. 135, 20–54 (2008).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (23) https://doi.org/10.1088/0004-6256/135/1/20
  23. Zoccali, M. et al. Age and metallicity distribution of the Galactic bulge from extensive optical and near-IR stellar photometry. Astron. Astrophys. 399, 931–956 (2003).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (24) https://doi.org/10.1051/0004-6361:20021604
  24. Nataf, D. M. The controversial star-formation history and helium enrichment of the Milky Way bulge. Publ. Astron. Soc. Aust. 33, e023 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (25) https://doi.org/10.1017/pasa.2015.38
  25. Hasselquist, S. et al. Exploring the stellar age distribution of the Milky Way bulge using APOGEE. Astrophys. J. 901, 109 (2020).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (26) https://doi.org/10.3847/1538-4357/abaeee
  26. Lian, J. et al. The Milky Way’s bulge star formation history as constrained from its bimodal chemical abundance distribution. Mon. Not. R. Astron. Soc. 497, 3557–3570 (2020).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (27) https://doi.org/10.1093/mnras/staa2205
  27. Bovy, J. et al. Life in the fast lane: a direct view of the dynamics, formation, and evolution of the Milky Way’s bar. Mon. Not. R. Astron. Soc. 490, 4740–4747 (2019).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (28) https://doi.org/10.1093/mnras/stz2891
  28. Frankel, N., Sanders, J., Rix, H.-W., Ting, Y.-S. & Ness, M. The inside-out growth of the Galactic disk. Astrophys. J. 884, 99 (2019).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (29) https://doi.org/10.3847/1538-4357/ab4254
  29. Minniti, D., Saito, R. K., Alonso-García, J., Lucas, P. W. & Hempel, M. The edge of the Milky Way stellar disk revealed using clump giant stars as distance indicators. Astrophys. J. Lett. 733, L43 (2011).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (30) https://doi.org/10.1088/2041-8205/733/2/L43
  30. Sellwood, J. A. & Binney, J. J. Radial mixing in galactic discs. Mon. Not. R. Astron. Soc. 336, 785–796 (2002).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (31) https://doi.org/10.1046/j.1365-8711.2002.05806.x
  31. Martínez-Serrano, F. J., Serna, A., Doménech-Moral, M. & Domínguez-Tenreiro, R. Disk galaxies with broken luminosity profiles from cosmological simulations. Astrophys. J. Lett. 705, L133–L137 (2009).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (32) https://doi.org/10.1088/0004-637X/705/2/L133
  32. Ruiz-Lara, T. et al. Observational hints of radial migration in disc galaxies from CALIFA. Astron. Astrophys. 604, A4 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (33) https://doi.org/10.1051/0004-6361/201730705
  33. Lian, J. et al. Quantifying radial migration in the Milky Way: inefficient over short time-scales but essential to the very outer disc beyond 15 kpc. Mon. Not. R. Astron. Soc. 511, 5639–5655 (2022).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (34) https://doi.org/10.1093/mnras/stac479
  34. Shen, S. et al. The size distribution of galaxies in the Sloan Digital Sky Survey. Mon. Not. R. Astron. Soc. 343, 978–994 (2003).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (35) https://doi.org/10.1046/j.1365-8711.2003.06740.x
  35. Blanton, M. R., Kazin, E., Muna, D., Weaver, B. A. & Price-Whelan, A. Improved background subtraction for the Sloan Digital Sky Survey images. Astron. J. 142, 31 (2011).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (36) https://doi.org/10.1088/0004-6256/142/1/31
  36. York, D. G. et al. The Sloan Digital Sky Survey: technical summary. Astron. J. 120, 1579–1587 (2000).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (37) https://doi.org/10.1086/301513
  37. Simard, L., Mendel, J. T., Patton, D. R., Ellison, S. L. & McConnachie, A. W. A catalog of bulge+disk decompositions and updated photometry for 1.12 million galaxies in the Sloan Digital Sky Survey. Astrophys. J. Suppl. Ser. 196, 11 (2011).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (38) https://doi.org/10.1088/0067-0049/196/1/11
  38. Willett, K. W. et al. Galaxy Zoo 2: detailed morphological classifications for 304 122 galaxies from the Sloan Digital Sky Survey. Mon. Not. R. Astron. Soc. 435, 2835–2860 (2013).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (39) https://doi.org/10.1093/mnras/stt1458
  39. Hart, R. E. et al. Galaxy Zoo: comparing the demographics of spiral arm number and a new method for correcting redshift bias. Mon. Not. R. Astron. Soc. 461, 3663–3682 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (40) https://doi.org/10.1093/mnras/stw1588
  40. Lian, J., Bergemann, M., Pillepich, A., Zasowski, G. & Lane, R. R. The integrated metallicity profile of the Milky Way. Nat. Astron. 7, 951–958 (2023).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (41) https://doi.org/10.1038/s41550-023-01977-z
  41. van der Wel, A. et al. 3D-HST+CANDELS: the evolution of the galaxy size–mass distribution since z = 3. Astrophys. J. 788, 28 (2014).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (42) https://doi.org/10.1088/0004-637X/788/1/28
  42. Schönrich, R. & Binney, J. Chemical evolution with radial mixing. Mon. Not. R. Astron. Soc. 396, 203–222 (2009).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (43) https://doi.org/10.1111/j.1365-2966.2009.14750.x
  43. Blanton, M. R. et al. Sloan Digital Sky Survey IV: Mapping the Milky Way, nearby galaxies, and the distant Universe. Astron. J. 154, 28 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (44) https://doi.org/10.3847/1538-3881/aa7567
  44. Wilson, J. C. et al. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectrographs. Publ. Astron. Soc. Pac. 131, 055001 (2019).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (45) https://doi.org/10.1088/1538-3873/ab0075
  45. Bowen, I. S. & Vaughan, A. H. The optical design of the 40-in. telescope and of the Irénée DuPont telescope at Las Campanas Observatory, Chile. Appl. Opt. 12, 1430–1434 (1973).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (46) https://doi.org/10.1364/AO.12.001430
  46. Gunn, J. E. et al. The 2.5 m telescope of the Sloan Digital Sky Survey. Astron. J. 131, 2332–2359 (2006).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (47) https://doi.org/10.1086/500975
  47. Nidever, D. L. et al. The data reduction pipeline for the Apache Point Observatory Galactic Evolution Experiment. Astron. J. 150, 173 (2015).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (48) https://doi.org/10.1088/0004-6256/150/6/173
  48. García Pérez, A. E. et al. ASPCAP: the APOGEE stellar parameter and chemical abundances pipeline. Astron. J. 151, 144 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (49) https://doi.org/10.3847/0004-6256/151/6/144
  49. Smith, V. V. et al. The APOGEE Data Release 16 spectral line list. Astron. J. 161, 254 (2021).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (50) https://doi.org/10.3847/1538-3881/abefdc
  50. Pinsonneault, M. H. et al. The second APOKASC catalog: the empirical approach. Astrophys. J. Suppl. Ser. 239, 32 (2018).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (51) https://doi.org/10.3847/1538-4365/aaebfd
  51. Mackereth, J. T. et al. Dynamical heating across the Milky Way disc using APOGEE and Gaia. Mon. Not. R. Astron. Soc. 489, 176–195 (2019).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (52) https://doi.org/10.1093/mnras/stz1521
  52. Leung, H. W. & Bovy, J. Deep learning of multi-element abundances from high-resolution spectroscopic data. Mon. Not. R. Astron. Soc. 483, 3255–3277 (2019).
  53. Bressan, A. et al. PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code. Mon. Not. R. Astron. Soc. 427, 127–145 (2012).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (53) https://doi.org/10.1111/j.1365-2966.2012.21948.x
  54. Chen, Y. et al. Improving PARSEC models for very low mass stars. Mon. Not. R. Astron. Soc. 444, 2525–2543 (2014).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (54) https://doi.org/10.1093/mnras/stu1605
  55. Chen, Y. et al. PARSEC evolutionary tracks of massive stars up to 350 M⊙ at metallicities 0.0001 ≤ Z ≤ 0.04. Mon. Not. R. Astron. Soc. 452, 1068–1080 (2015).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (55) https://doi.org/10.1093/mnras/stv1281
  56. Marigo, P. et al. A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase. Astrophys. J. 835, 77 (2017).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (56) https://doi.org/10.3847/1538-4357/835/1/77
  57. Bovy, J., Rix, H.-W., Green, G. M., Schlafly, E. F. & Finkbeiner, D. P. On galactic density modeling in the presence of dust extinction. Astrophys. J. 818, 130 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (57) https://doi.org/10.3847/0004-637X/818/2/130
  58. Kroupa, P. On the variation of the initial mass function. Mon. Not. R. Astron. Soc. 322, 231–246 (2001).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (58) https://doi.org/10.1046/j.1365-8711.2001.04022.x
  59. Maraston, C. Evolutionary population synthesis: models, analysis of the ingredients and application to high-z galaxies. Mon. Not. R. Astron. Soc. 362, 799–825 (2005).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (59) https://doi.org/10.1111/j.1365-2966.2005.09270.x
  60. Choi, J. et al. Mesa Isochrones and Stellar Tracks (MIST). I. Solar-scaled models. Astrophys. J. 823, 102 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (60) https://doi.org/10.3847/0004-637X/823/2/102
  61. Dotter, A. MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones. Astrophys. J. Suppl. Ser. 222, 8 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (61) https://doi.org/10.3847/0067-0049/222/1/8
  62. Chen, B. Q. et al. Three-dimensional interstellar extinction map toward the Galactic bulge. Astron. Astrophys. 550, A42 (2013).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (62) https://doi.org/10.1051/0004-6361/201219682
  63. Launhardt, R., Zylka, R. & Mezger, P. G. The nuclear bulge of the Galaxy. III. Large-scale physical characteristics of stars and interstellar matter. Astron. Astrophys. 384, 112–139 (2002).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (63) https://doi.org/10.1051/0004-6361:20020017
  64. Sormani, M. C. et al. Jeans modelling of the Milky Way’s nuclear stellar disc. Mon. Not. R. Astron. Soc. 499, 7–24 (2020).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (64) https://doi.org/10.1093/mnras/staa2785
  65. Lian, J., Yan, R., Zhang, K. & Kong, X. The quenching timescale and quenching rate of galaxies. Astrophys. J. 832, 29 (2016).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (65) https://doi.org/10.3847/0004-637X/832/1/29
  66. Kauffmann, G. et al. The host galaxies of active galactic nuclei. Mon. Not. R. Astron. Soc. 346, 1055–1077 (2003).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (66) https://doi.org/10.1111/j.1365-2966.2003.07154.x
  67. Brinchmann, J. et al. The physical properties of star-forming galaxies in the low-redshift Universe. Mon. Not. R. Astron. Soc. 351, 1151–1179 (2004).
    The broken-exponential radial structure and larger size of the Milky Way galaxy (67) https://doi.org/10.1111/j.1365-2966.2004.07881.x

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The broken-exponential radial structure and larger size of the Milky Way galaxy (2024)

FAQs

How big is the Milky Way galaxy __________________ across ____________________ thick? ›

It is approximately 100,000 light years across and about 1000 light years thick. It has a central bulge that is about 10,000 light years in diameter. Our solar system is about a third of the way towards the edge of the Galaxy from the central bulge.

What is the size and structure of the Milky Way galaxy quizlet? ›

The width of the galaxy is about 100,000 light-years. The thickness is about 10,000 light-years at the nucleus. The structure of the galaxy is made up of three spiral arms. The sun is on one arm, two thirds of the distance from the nucleus that is the center of the galaxy.

What is a way to relate the size of the Milky Way galaxy to the size of the our solar system? ›

On that scale with our Solar System in your hand, the Milky Way Galaxy, with its 200 – 400 billion stars, would span North America (see the illustration on the right). Galaxies come in many sizes. The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger.

How does the Milky Way compare in size to the largest known galaxy? ›

The title for the biggest galaxy known to man is IC 1101. It has a radius of 1.9569 million light years which absolutely dwarfs our Milky Way's radius of only 52,850 light years. And is around 12.31 billion years old. This supergiant elliptical galaxy is located 320 megaparsecs (1.05 billion light-years) from Earth.

What is the structure of the Milky Way galaxy? ›

The Galaxy resembles other spiral systems, featuring as it does a bright, flat arrangement of stars and gas clouds that is spread out over its entirety and marked by a spiral structure. The disk can be thought of as being the underlying body of stars upon which the arms are superimposed.

How did the Milky Way get so large? ›

The evolution of the Milky Way began when clouds of gas and dust started collapsing, pushed together by gravity. First stars sprung up from the collapsed clouds, those that we see today in the globular clusters. The spherical halo emerged soon after, followed by the flat galactic disk.

What correctly describes the size of the Milky Way galaxy? ›

The Milky Way is a barred spiral galaxy with a D25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), but only about 1,000 light-years thick at the spiral arms (more at the bulge).

What size galaxy is the Milky Way? ›

Our galaxy probably contains 100 to 400 billion stars, and is about 100,000 light-years across. That sounds huge, and it is, at least until we start comparing it to other galaxies. Our neighboring Andromeda galaxy, for example, is some 220,000 light-years wide.

How did we determine the size of the Milky Way? ›

Center for Astrophysics | Harvard & Smithsonian astronomers use many methods to study the Milky Way: Measuring precise distances and 3-dimensional motions for massive star-forming regions in the disk of the Milky Way in order to map out its spiral structure and determine its overall size and rotation speed.

How many times larger is the Milky Way than the size of the Solar System? ›

The Milky Way galaxy is approximately 100,000 light years across, the diameter of the Solar System is 0.00125 light years. Interpret how much larger the diameter of the Milky Way is compared to the Solar System. Answers: The diameter of the Milky Way is 8 million times larger than the diameter of the Solar System.

How does the size and shape of the Milky Way compare to other galaxies in the universe? ›

While the Milky Way is considered averagely large, boasting a diameter of 100 000 light years and hosting an estimated 200 billion to 400 billion stars, it appears dwarfed when compared with larger galaxies such as M100, M87, NGC 4921, or Hercules A.

What if the Milky Way was the size of the United States? ›

As noted below, if the Milky Way was the size of the continental United States, the sun would be about the size of a red blood cell, and the earth about one-third the size of the coronavirus. And as with all good videos discussing the stars, it ends with a Carl Sagan quote!

What is the biggest thing in the Milky Way? ›

In terms of mass, the galaxy's central black hole weighs 4,154,000 times as much as the sun, give or take, and by that metric, the central black hole is easily the largest 'object' in the galaxy, even if, its spatial dimensions are effectively zero.

What is more bigger than Milky Way galaxy? ›

Some galaxies are bigger than others, but bigger than any single galaxy are galaxy groups, and larger than those are galaxy clusters. Below you can see the progression of things, from a single galaxy to whole regions of the universe.

What object is bigger than the Milky Way? ›

The galaxy, called ZF-UDS-7329, contains more stars than the Milky Way, despite having formed only 800 million years into the universe's 13.8 billion-year life span. This means they were somehow born without dark matter seeding their formation, contrary to what the standard model of galaxy formation suggests.

How big is the Milky Way galaxy thick? ›

Latest estimates show that the Milky Way is believed to be about 12,000 light years thick, from top to bottom. The “ball” of the Milky Way is known as its “bulge” and is about 10,000 light years across, containing a dense halo of stars, gas, and dust. At the center of the bulge is the area known as the Galactic Center.

What is the normal size of the Milky Way? ›

The Milky Way is a barred spiral galaxy with a D25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), but only about 1,000 light-years thick at the spiral arms (more at the bulge).

Is the Milky Way an average size galaxy? ›

While the Milky Way is considered averagely large, boasting a diameter of 100 000 light years and hosting an estimated 200 billion to 400 billion stars, it appears dwarfed when compared with larger galaxies such as M100, M87, NGC 4921, or Hercules A.

How big are we in the Milky Way? ›

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