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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 …
2 thg 5, 2025 · Astronomers think the youngest known galaxy formed approximately 500 million years ago. Galaxies can organize into groups of about 100 or fewer members held together by …
17 thg 4, 2019 · A composite image of the Messier 81 (M81) galaxy shows what astronomers call a 'grand design' spiral galaxy, where each of its arms curls all the way down into its center.
4 thg 1, 2019 · The gas and dust in a spiral galaxy circles the center at speeds of hundreds of miles per second, creating their pinwheel shape.
What is a galaxy, and what are the different types found in the Universe? Find out about galaxy formation and the history of their study.
8 thg 11, 2023 · When you look at a normal galaxy, most of the light comes from the stars in visible wavelengths and is evenly distributed throughout the galaxy. However, if you observe …
4 ngày trước · 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 …
19 thg 3, 2025 · The Basics: What Is a Galaxy, Really? At its core, a galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and …
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, …
9 thg 5, 2025 · In modern times, though, we use “galaxy” more generically to refer to any large system of stars, gas, dust and dark matter, all held together by their mutual gravity.
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