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Write a short note on Galaxies..★★
Answers
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Galaxies are collections of stars, dust, and gas rotating around super massive black holes. It is believed that there are 200 million or more galaxies in the known universe. A galaxy can range in the number of stars as well as its size.Small galaxies, such as dwarf galaxies, can contain as little as tens of millions of stars, while on the other end of the scale, there are massive galaxies with hundreds of trillions of stars. The diameter of an average galaxy can reach 326,000 light years, meaning that it would take light 326,000 years to cross the average galaxy.In 1929, Edwin Hubble began to organize and classify the different types of galaxies that were being observed by astronomers. The result was the Hubble Classification System, which categorizes galaxies into three main categories: spiral, elliptical, and irregular...
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☆A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
☆ The word galaxy is derived from the Greekgalaxias (γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few hundred million (108) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass.
