Hubble's Field Guide to Galaxies

  • Released Monday, May 9th, 2022
  • Updated Wednesday, May 3rd, 2023 at 11:44AM

Galaxies are the visible foundation of the universe; each one a collection of stars, planets, gas, dust, and dark matter held together by gravity. Hubble’s observations give us insight into how galaxies form, grow, and evolve through time.

Hubble’s namesake, astronomer Edwin Hubble, pioneered the study of galaxies based simply on their appearance. He divided galaxies into three basic forms:

This “Field Guide” will quickly teach you those three basic forms, and some new ones that astronomers have added over the years!

For more information, visit

Additional Credits:
Images of Edwin Hubble via Edwin P. Hubble Papers of the Huntington Library, San Mario, California.

Music Credits:
“Gravity Cruise - Underscore” by Jon Buster Cottam [PRS], and Samuel William John Walker [PRS] via Ninja Tune Production Music, and Universal Production Music

Vertical Version

This vertical version of the episode is for IGTV or Snapchat. The IGTV episode can be pulled into Instagram Stories and the regular Instagram feed.


Please give credit for this item to:
NASA's Goddard Space Flight Center. However, please credit individual items as indicated above.


This visualization is related to the following missions: