Describe the different stages of life cycle of stars?
Question: Describe the different stages of life cycle of stars?
Stars are born from clouds of gas and dust in interstellar space. They go through different stages of life cycle depending on their mass and composition. The main stages of stellar evolution are:
- Protostar: A protostar is a clump of gas and dust that collapses under its own gravity and starts to heat up due to nuclear fusion in its core.
- Main sequence: A main sequence star is a stable star that burns hydrogen into helium in its core. The Sun is a main sequence star. This stage lasts for most of the star's life.
- Red giant: A red giant star is a star that has exhausted its hydrogen fuel in its core and starts to burn helium into heavier elements. The star expands and cools down, becoming red in color. The Sun will become a red giant in about 5 billion years.
- White dwarf: A white dwarf star is a star that has shed its outer layers and left behind a dense core of carbon and oxygen. The star no longer produces energy by fusion, but radiates heat from its core. White dwarfs are very hot and bright, but small in size.
- Supernova: A supernova is a massive explosion that occurs when a massive star runs out of fuel and collapses under its own gravity. The star releases a huge amount of energy and ejects its outer layers into space, forming a nebula. Supernovae are very rare and very bright events.
- Neutron star: A neutron star is a star that has collapsed into a very dense ball of neutrons after a supernova. Neutron stars have very strong magnetic fields and spin very fast, emitting beams of radiation from their poles. Some neutron stars are called pulsars because they appear to pulse as their beams sweep across the sky.
- Black hole: A black hole is a star that has collapsed into a point of infinite density and gravity after a supernova. Nothing can escape from a black hole, not even light. Black holes are invisible, but can be detected by their effects on the surrounding matter and space-time.
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