- Galaxy - Wikipedia
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), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System
- List of galaxies - Wikipedia
There are an estimated 100 billion galaxies in all of the observable universe [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list)
- Galaxies - NASA Science
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
- Definition, Formation, Types, Properties, Facts - Britannica
Galaxies differ from one another in shape, with variations resulting from the way in which the systems were formed and subsequently evolved Galaxies are extremely varied not only in structure but also in the amount of activity observed
- What Is a Galaxy? | NASA Space Place – NASA Science for Kids
There are many galaxies besides ours, though There are so many, we can’t even count them all yet! The Hubble Space Telescope looked at a small patch of space for 12 days and found 10,000 galaxies, of all sizes, shapes, and colors
- Galaxy Types - Science@NASA
Scientists sometimes categorize galaxies based on their shapes and physical features Other classifications organize galaxies by the activity in their central regions – powered by a supersized black hole – and the angle at which we view them
- Galaxies—facts and information | National Geographic
Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity Nearly all large galaxies are thought to also
- Hubbles Galaxies - Science@NASA
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 Credit: NASA's Goddard Space Flight Center; Lead Producer: Miranda Chabot; Lead Writer: Andrea Gianopoulos
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