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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
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
What’s a galaxy? All you need to know - EarthSky A galaxy is a vast island of gas, dust and stars in an ocean of space Typically, galaxies are millions of light-years apart Galaxies are the building blocks of our universe
What is a Galaxy? - sciencenewstoday. org The Basics: What Is a Galaxy, Really? At its core, a galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter These components are woven together by gravity, forming complex and beautiful structures that can span tens of thousands to hundreds of thousands of light-years
How Galaxies Work | HowStuffWorks 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 " There are many types of galaxies spanning all sorts of shapes and sizes
Size, composition, and structure of galaxies | Britannica galaxy, Any of the billions of systems of star s and interstellar matter that make up the universe Galaxies vary considerably in size, composition, structure, and activity, but nearly all are arranged in groups, or clusters, containing from a few galaxies to as many as 10,000
What Are Galaxies? (With Understandable Details) - Owlcation A galaxy is an astronomical unit composed of a cluster of stars, planets, and, in most or possibly all cases, a supermassive black hole Indeed, other material also makes up the galaxy, including anything clustered about and gravitationally bound to a supermassive black hole This includes gas clouds and even dark matter
What is a galaxy? - Live Science Galaxies are groups of stars and other space objects held together by gravity There are more than 100 billion galaxies in the universe, each presenting beautiful structures that can be seen in
Imagine the Universe! A galaxy is a large group of stars, gas, and dust bound together by gravity Our solar system resides in the Milky Way galaxy, a spiral galaxy that is part of a group of galaxies called the Local Group