Galaxy - Wikipedia Galaxies, averaging an estimated 100 million stars, [3] range in size from dwarfs with less than a thousand stars, [4] to the largest galaxies known – supergiants with one hundred trillion stars, each orbiting its galaxy's centre of mass
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
Galaxy | Definition, Formation, Types, Properties, Facts | Britannica galaxy, 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 Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants
What is a Galaxy? - sciencenewstoday. org Galaxies are the grand islands of the universe, each one a vast metropolis of stars, gas, dust, dark matter, and endless possibility From tiny dwarfs to sprawling giants, galaxies tell the story of the cosmos—its birth, evolution, and perhaps its ultimate fate
UNIVERSE MAP Universe Map is your definitive guide to galaxies, stars, and cosmic structures — mapped, analyzed, and optimized for discovery and research
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 contain
Types of Galaxies | Pictures, Facts, and Information Explore the main types of galaxies: spiral, elliptical, barred and irregular with stunning astrophotography and insights into how galaxies form, collide evolve
Types - NASA Science Our Milky Way is one example of a broad class of galaxies defined by the presence of spiral arms These galaxies resemble giant rotating pinwheels with a pancake-like disk of stars and a central bulge or tight concentration of stars
Galaxy Formation and Evolution - Harvard–Smithsonian Center for . . . But galaxies haven’t always been around, and they have changed over the universe’s 13 8 billion-year history Astronomers study the ways galaxies form and evolve by comparing the different shapes across the history of the cosmos, and tracing how they came to look the way they do
Galaxies - HyperPhysics Two small irregular galaxies called the "Magellanic Clouds" are relatively near the Milky Way The Large Magellanic Cloud is at about 160,000 light years and the Small Magellanic Cloud is at about 200,000 light years from us The Andromeda galaxy is the nearest large galaxy at about 900 kiloparsecs or 2 9 million light years