Home » World Geography » Physical Geography of the World » Origin and Evolution of Universe Solar System » Origin and Evolution of the Earth » Formation of Galaxies and Stars
- The distribution of matter and energy was not even in the early universe.
- These initial density differences gave rise to differences in gravitational forces and it caused the matter to get drawn together.
- These formed the bases for development of galaxies.
- A galaxy contains a large number of stars.
- Galaxies spread over vast distances that are measured in thousands of light-years.
- The diameters of individual galaxies range from 80,000-150,000 light years.
- A galaxy starts to form by accumulation of hydrogen gas in the form of a very large cloud called nebula.
- Eventually, growing nebula develops localised clumps of gas.
- These clumps continue to grow into even denser gaseous bodies, giving rise to formation of stars.
- The formation of stars is believed to have taken place some 5-6 billion years ago.
