Galaxy a23: What is a galaxy

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. 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. 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. The Milky Way or Milky Way Galaxy [c] is the galaxy that includes the Solar System, with the name describing the galaxy 's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy , which are so far away that they cannot be individually distinguished by the naked eye. The Milky Way is a barred spiral galaxy with a D 25 isophotal diameter estimated at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), [10] but only about 1,000 light ...