2024年10月22日 · 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 …

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 …

2021年1月12日 · Our universe includes a variety of astonishing and sometimes bizarre objects. Massive black holes so powerful, they swallow nearby objects. Galaxies that merge into giant …

Explore the night sky with NASA's interactive star map and discover constellations, planets, and more.

2025年2月27日 · 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 …

2025年1月14日 · What Is a Galaxy? The Short Answer: A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity. We live on a planet …

2024年10月22日 · The youngest stars form in gas-rich arms, while older stars can be found throughout the disk and within the bulge and halo. Both the Milky Way and the Andromeda …

2023年9月14日 · NASA’s James Webb Space Telescope has peered into the chaos of the Cartwheel Galaxy, revealing new details about star formation... This landscape of “mountains” …

2025年1月16日 · The Andromeda Galaxy, our closest galactic neighbor, holds over 1 trillion stars and has been a key to unlocking the secrets of the universe. Thanks to NASA’s Hubble Space …

2025年1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, …