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 …

5 days ago · 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 …

6 days ago · The existence of galaxies was not recognized until the early 20th century. Since then, however, galaxies have become one of the focal points of astronomical investigation. The notable …

In these news stories, you’ll find out what we’re learning about how galaxies form, evolve, and shape the beloved universe we call home. While small galaxies are expected to have even smaller satellite …

Typically, galaxies are millions of light-years apart. Galaxies are the building blocks of our universe. Their distribution isn’t random, as one might suppose. Instead, galaxies reside along...

3 days ago · Importantly, they live inside galaxies. The fact that globular clusters are only found inside galaxies would seem to suggest they are obviously a distinct cosmic phenomenon from galaxies …

Mar 19, 2025 · Galaxies are the cosmic environments where stars ignite, planets form, and the elements necessary for life are forged. Every atom in your body—carbon, oxygen, calcium, iron—was created …

Apr 17, 2019 · 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...

This page explains that galaxies are vast systems made up of stars, remnants, interstellar medium, and dark matter, named after the Greek word for milk. There are approximately 170 billion galaxies in the …

Explore our cosmic neighborhood in an interactive 3D map featuring the Milky Way, Andromeda, Triangulum, and dozens of nearby dwarf galaxies. Built for curious learners, stargazers, and …