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
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 called Earth that is part of our solar system. But where is our solar system? It’s a small part of the Milky Way Galaxy.
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.
'Grand' spiral galaxy dazzles in new Hubble Telescope photo | Space
4 天之前 · A grand spiral galaxy takes center stage in a new image from the Hubble Space Telescope. The galaxy, known as NGC 5643, is located roughly 40 million light-years from Earth in the constellation Lupus.
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...
Galaxy Facts - Interesting Facts about Galaxies - Space Facts
A galaxy is a massive, gravitationally bound system that consists of stars, stellar objects (such as brown dwarfs and neutron stars), nebulae, an interstellar medium of gas and dust, black holes, and an unknown component of dark matter.
Hubble's Galaxies - NASA Science
Our galaxy, the Milky Way, sits in a Local Group of more than 20 galaxies, but Hubble’s vision takes us far beyond our celestial neighborhood. Galaxies are the visible foundation of the universe; each one a collection of stars, planets, gas, dust, and dark matter held together by …
Solar System, Galaxy, Universe: What’s the Difference? - Science@NASA
2017年6月1日 · The Milky Way is big, but some galaxies, like our Andromeda Galaxy neighbor, are much larger. The universe is all of the galaxies – billions of them! NASA’s telescopes allow us to study galaxies beyond our own in exquisite detail, and to explore the most distant reaches of the observable universe.
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. Nature has provided an immensely varied array of galaxies, ranging from faint, diffuse dwarf objects to brilliant spiral-shaped giants.
How galaxies form: Theories, variants and growth | Space
2022年7月13日 · Here are some of the most promising theories of how galaxies form, how and why they merge, as well as the different varieties of galaxies that have been observed. As the universe expanded in size...
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