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23 thg 3, 2025 · A galaxy can contain hundreds of billions of stars and be many thousands of light-years across. Our own galaxy, the Milky Way, is around 100,000 light-years in diameter.
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.
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.
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 some galaxies, you'll see intense light coming from their nuclei.
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.
1 thg 9, 2025 · 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.
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.
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 their mutual gravity.
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.
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.
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