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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 ...

spaceplace.nasa.gov/galaxy/en

Sep 8, 2015 ... We live on a planet called Earth that is part of our solar system. But where is our solar system? It's a small part of the Milky Way Galaxy.

nightsky.jpl.nasa.gov/news-display.cfm?News_ID=573

Many people are not clear about the difference between our Solar System, our Milky Way Galaxy, and the Universe. Let's look at the basics. Our Solar System ...

science.nasa.gov/astrophysics/focus-areas/what-are-galaxies

Our galaxy, the Milky Way, is typical: it has hundreds of billions of stars, enough gas and dust to make billions more stars, and at least ten times as much dark ...

www.ask.com/youtube?q=What+Is+a+Galaxy%3F&v=FtHVoM4QFf8
Oct 22, 2012 ... Science expert Emerald Robinson explains what a galaxy is and discusses our own Milky Way Galaxy. To view over 15000 other how-to, DIY, ...

hubblesite.org/reference_desk/faq/all.php.cat=galaxies

The name of our galaxy is the Milky Way. Our Sun and all of the stars that you see at night belong to the Milky Way. When you go outside on a dark night and ...

www.universetoday.com/30534/what-is-a-galaxy

May 6, 2009 ... The simple answer is that a galaxy is a collection of stars held together ... In other words, all the stars in a galaxy are kept together by the gravity ...

www.nationalgeographic.com/science/space/universe/galaxies

A Hubble Space Telescope image shows unprecedented detail of the Antennae galaxies, an intense star-forming region created when two galaxies began to ...

web.utah.edu/astro/galaxy.html

Galaxies. What is a galaxy? "Floating" around the universe are billions of giant islands of billions of stars. Each galaxy contains upwards of 100's of billions of ...