May 2, 2025 · 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 …

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 …

Nov 27, 2025 · 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 …

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...

Mar 19, 2025 · 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 …

Universe Map is your definitive guide to galaxies, stars, and cosmic structures — mapped, analyzed, and optimized for discovery and research.

Jan 18, 2024 · What is a galaxy, and what are the different types found in the Universe? Find out about galaxy formation and the history of their study.

Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. NASA’s space telescopes have revealed intricate details of the shapes, structures, and histories of galaxies …

3 days ago · Dark matter makes up 27% of the universe, and understanding its behavior helps explain why galaxies, stars, and planets can exist at all.

1 day ago · The filament of matter stretches 50 million light-years, and contains a row of galaxies 5.5 million light-years long that are rotating in sync with the filament.