The Star Formation


In the initial universe, the distribution of matter and energy was not uniform. The density differences gave rise to differences in gravitational forces and it causes matter to attract together. These are the bases on which galaxies formed. The formation of galaxies started with an accumulation of hydrogen gas in the form of a very large cloud known as a nebula. Finally, the nebula starts growing and develops localized clumps of gases. These clumps continue to grow into even denser gaseous bodies. Hence, a star is formed. The formation of stars is believed to occur between 5-6 billion years ago.



  • A galaxy spread across thousands of light years. The diameter of each galaxy ranges from 80,000-150,000 light years.
  • Light year – The light year is a distance covered by light in a year at the speed of 300,000 km/second. It measures distance only.