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en.wikipedia.org/wiki/Galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias ( γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few billion (109) stars to giants ... The space between galaxies is filled with a tenuous gas having an average ...

teacherlink.ed.usu.edu/tlnasa/reference/imaginedvd/files/imagine/docs/ask_astro/answers/001205a.html

The Question. (Submitted December 05, 2000). What is the average size of a galaxy? The Answer. Thank you for your question. Our Milky Way galaxy is a pretty ...

www.universetoday.com/101185/how-big-are-galaxies

Ok, now that that's out of the way check out this graphic by Arecibo astrophysicist Rhys Taylor, which neatly illustrates the relative sizes of 25 selected galaxies ...

sites.google.com/site/coolspacefacts/facts-about-galaxies

4) Distribution of Normal Size Galaxies in Hubble Classification: Spiral-75%; Elliptical-20%; Irregular-5% (Edwin Hubble's data was skewed because spirals are ...

www.popsci.com/science/article/2013-04/cool-galaxy-size-comparison-chart

Apr 4, 2013 ... From "Galaxy Size Comparison Chart" by Rhys Taylor ... It's puny compared to M87, an elliptical galaxy 980,000 light years in diameter.

www.nasa.gov/multimedia/imagegallery/image_feature_996.html

During this period, six normal supernovae have occurred within the galaxies we' ve been monitoring, suggesting that 10 to 30 percent of massive stars die as ...

physics.stackexchange.com/questions/59579/how-far-apart-are-galaxies-on-average-if-galaxies-were-the-size-of-peas-how-ma

The actual number: How far apart are galaxies on average? ... The simple answer is that the average galaxy spacing is around a few ...

socratic.org/questions/how-do-galaxies-range-in-size

Jan 13, 2016 ... Galaxies vary widely in size depending upon their shape. The typical size of a galaxy is 3,260 light years to 326,000 light years across.

ned.ipac.caltech.edu/level5/PROPERTIES/dog.html

Redman [222] suggested that galaxy diameters should be operationally ... the average surface brightness contained within an ellipse of diameter D25 and axial  ...

abyss.uoregon.edu/~js/glossary/galaxy.html

Galaxies vary considerably in size, composition, and structure, but nearly all of them ... Spiral galaxies are generally subdivided into "normal" and "barred" types.