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 Is a Galaxy? | NASA Space Place – NASA Science for Kids
2024年11月8日 — A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
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.
Galaxy | Definition, Formation, Types, Properties, & Facts | Britannica
2024年11月25日 — 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.
ViewSpace
ViewSpace is a free, web-based collection of digital interactives and videos highlighting the latest developments in astronomy and Earth science. ViewSpace gives you the opportunity to explore our planet, solar system, galaxy, and universe.
Large Scale Structures - NASA Science
But galaxies, including the Milky Way, are often part of larger structures and superstructures in space. Galaxy groups and clusters are collections of galaxies bound together by gravity. They are building blocks for the larger-scale structures of the universe.
Webb Unlocks Secrets of One of the Most Distant Galaxies Ever Seen
2024年3月4日 — Initially detected with NASA’s Hubble Space Telescope, this galaxy — one of the youngest and most distant ever observed — is so bright that it is challenging scientists to understand why. Now, GN-z11 is giving up some of its secrets.
What’s a galaxy? All you need to know - EarthSky
2024年5月21日 — What is a galaxy? 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.
Galaxies: Collisions, Types and How They're Made | Space
2019年1月4日 — Galaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made up almost...
Galaxies - HubbleSite
2024年10月28日 — Galaxies are vast cosmic islands of stars, gas, dust, and dark matter held together by gravity. Hubble’s keen eye has revealed intricate details of the shapes, structures, and histories of galaxies — whether alone, as part of small groups, or within immense clusters.