GALAXY NOTE 2 News, Videos, Twitter, Pictures, Q&A

A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. [1][2] The word is derived from the Greek galaxias (γαλαξίας), meaning 'milky', a reference to the Milky Way galaxy that contains the Solar System.

Galaxies - NASA Science
science.nasa.gov

Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. The largest contain trillions of stars and can be more than a million light-years across. The smallest can contain a few thousand stars and span just a few hundred light-years.

Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
www.britannica.com

What is a galaxy? A galaxy is any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars. Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across.

What is a galaxy? - BBC Sky at Night Magazine
www.skyatnightmagazine.com

A galaxy is a concentration of millions or billions of stars, gas clouds and pockets of dust, all bound by gravity and swathed in a cocoon of mysterious dark matter.

What’s a galaxy? All you need to know about galaxies - EarthSky
earthsky.org

A galaxy can contain hundreds of billions of stars and be many thousands of light-years across. Our own galaxy, the Milky Way, is around 100,000 light-years in diameter.

What is a Galaxy? - sciencenewstoday.org
www.sciencenewstoday.org

A galaxy is one of the largest structures in the universe. It is a gravitationally bound system made up of stars, planets, gas, dust, dark matter, and often mysterious phenomena such as black holes and energetic cosmic radiation.

ESA - Guide to our galaxy - European Space Agency
www.esa.int

This virtual journey, from the centre of the Milky Way to its outskirts, shows the different components that make up our galaxy, which is home to about a hundred billion stars.

What Is a Galaxy? | NASA Space Place – NASA Science for Kids
spaceplace.nasa.gov

What Is a Galaxy? The Short Answer: A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. 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.

How Galaxies Work | HowStuffWorks
science.howstuffworks.com

A galaxy is a large system of stars, gas (mostly hydrogen), dust and dark matter that orbits a common center and is bound together by gravity — you can think of them as "island universes."