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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.
6 days ago · A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. When you look up at stars in the night sky, you’re seeing other stars in the Milky Way.
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.
4 days ago · 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.
- 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...
- Galaxies differ in shape, with variations resulting from how the systems were formed and subsequently evolved. Galaxies are extremely varied not on...
- Galaxy classification is based on the scheme proposed by the American astronomer Edwin Hubble. Hubble’s scheme is based on the optical appearance o...
- NGC 1302 is an example of the normal type of Sa galaxy, while NGC 4866 represents one with a small nucleus and arms consisting of thin dust lanes o...
Apr 17, 2019 · Types of galaxies. Before the 20th century, we didn't know that galaxies other than the Milky Way existed; earlier astronomers had classified them as as “nebulae,” since they looked like fuzzy ...
Jan 31, 2024 · Galaxy Formation. The Building Blocks of the Universe. 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.
Overview Our Sun is just one of a vast number of stars within a galaxy called the Milky Way, which in turn is only one of the billions of galaxies in our universe. These massive cosmic neighborhoods, made up of stars, dust, and gas held together by gravity, come in a variety of sizes, from […]
