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Life cycle of stars


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This ppt presentation shows about the life of stars form birth to end

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Life cycle of stars

  1. 1. Life cycle of stars Presented by, Dhivyaprasath K 13PPH124
  2. 2. What is star? • Hot gas and dust cloud • Heat of stars made in Centre by nuclear fusion reaction • There are lots of different colours and sizes of star • Some times we consider stars as our thatha patti…
  3. 3. Birth of stars • Nebula is the birth place of the stars • It has cloud of gas (hydrogen) and dust of space • There are different types of nebula • Eg : Emission nebula, planetary Nebula and so on.
  4. 4. Protostar • As it the stellar materials pulls tighter and tighter together. It heats up pushing against further gravitational collapse. At this point the object is known as Protostar. • The protostar phase of stellar evolution lasts about 100,000 years
  5. 5. Main sequence Star • A star is a luminous globe of gas producing its own heat and light by nuclear fusion reaction. • The surface temperatures range from 2000°C to above 30,000°C , and the corresponding colors from red to blue-white. • They live for less than a million years before exploding as supernovae
  6. 6. Red Giant • This is the bright star with a cool surface • It is formed during the Sun, as it runs out of hydrogen fuel at its center • These stars have diameters up to 1000 times that of sun.
  7. 7. Red dwarf • These are very cool, faint and small stars, • They burn very slowly and have estimated lifetimes of 100 billion years.
  8. 8. White dwarf • This is very small and hot star • It consist of degenerate matter with a very high density due to gravitational effects • The surface temp is 8000° C
  9. 9. Supernova • This is explosive death of star, and often results in the star obtaining the brightness of 100 million suns for a short time.
  10. 10. Neutron Stars • These stars are composed mainly of neutron and are produced when a supernova explodes, forcing the protons and electrons to combine to produce a neutron star. • Its gravity will be so strong.
  11. 11. Black holes • Black holes are believed to form from massive stars at the end of their life times. • The gravitational pull in a black hole is so great. • The density of matter in a black hole cannot be measured • It distort the space around them, suck neighboring matter into them including stars.
  12. 12. Life cycle of star
  13. 13. Thank you for your attention