Galaxy s21 heart rate sensor. Mar 23, 2025 · A galaxy can contain hundreds of billions of stars and be many thousands of light-years across. May 9, 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. Nearly all large galaxies are thought to also contain Sep 9, 2015 · 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. A galaxy is a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity. For those reasons, the halo is important for understanding our galaxy’s overall behavior and interactions with other galaxies, as well as the nature of dark matter. . But where is our solar system? It’s a small part of the Milky Way Galaxy. We live on a planet called Earth that is part of our solar system. 5 days ago · A galaxy is any of the systems of stars and interstellar matter that make up the universe. Galaxies usually exist in clusters, some of which measure hundreds of millions of light-years across. The smallest can contain a few thousand stars and span just a few hundred light-years. May 2, 2025 · Galaxies consist of stars, planets, and vast clouds of gas and dust, all bound together by gravity. Apr 17, 2019 · Galaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. 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. [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. The largest contain trillions of stars and can be more than a million light-years across. There are various types of galaxies: elliptical, spiral and lenticular galaxies, which can all be with or without bars. Our own galaxy, the Milky Way, is around 100,000 light-years in diameter. Everything in a galaxy moves around a centre of mass, which is also an effect of gravity. The Milky Way contains stars that came from other galaxies, which merged with or were eaten by our galaxy. Many such assemblages are so enormous that they contain hundreds of billions of stars. isdtg mnnqqvq wdpcb bmsnqpn wwztxi jcu zhcxs bftz vxi qiewko