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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 ...

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

Apr 4, 2013 ... The M100 galaxy, which is about 60 percent larger than the Milky Way, next to the M97 galaxy. From "Galaxy Size Comparison Chart" by Rhys ...

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

At first glance, this galaxy appears to be a normal spiral galaxy, much like the Milky ..... Along with Spitzer, the space telescopes size up the masses of the galaxy ...

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  ...

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 ...

oneminuteastronomer.com/5001/size-of-milky-way

Dec 5, 2011 ... A Neat Trick to Understand the Size of the Galaxy ... inch away, then Jupiter would lie 5.2 inches away and Pluto an average of 40 inches away.

arxiv.org/abs/1211.1005

Nov 5, 2012 ... We find that compact galaxies with radii and mass densities ... the average amount of size evolution of individual galaxies between high- and ...