Astronomers from the Aryabhatta Research Institute of Observational Sciences (ARIES) have found out the reasons behind intense star formation in some dwarf galaxies.
Formation of Stars and Galaxies
- 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.
Seven Main Stages of a Star
Stars come in a variety of masses and the mass determines how radiantly the star will shine and how it dies. Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white dwarf surrounded by a disappearing planetary nebula. All stars, irrespective of their size, follow the same 7 stage cycle, they start as a gas cloud and end as a star remnant.
1. Giant Gas Cloud
2. Protostar
3. T-Tauri Phas
4. Main Sequence
5. Red Giant
6. The Fusion of Heavier Elements
7. Supernovae and Planetary Nebulae
Star Formation,Star Formation
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