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Formation of the sun and stellar equilibrium

Space physics • Solar system and orbits

Key concepts

What you'll likely be quizzed about

  • Stars originate in nebulae, which are large clouds of gas and dust.
  • Gravity acts on these clouds, causing them to collapse and form dense regions.
  • As the material gathers in these regions, the gravitational force increases, pulling more gas and dust inward.
  • This process can take thousands or even millions of years.
  • Once the core becomes sufficiently dense, nuclear fusion ignites.
  • Fusion reactions convert hydrogen into helium, producing energy that powers the star.
  • This energy generates an outward pressure that balances the inward pull of gravity, establishing a stable state known as hydrostatic equilibrium.

Flashcards

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What are the stages of stellar evolution after formation?

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After formation, stars undergo several stages, including main sequence, red giant, and potentially supernova or white dwarf.

Key notes

Important points to keep in mind

Stars form in nebulae from gas and dust.

Gravity initiates the collapse leading to star formation.

Hydrostatic equilibrium balances gravity and pressure.

Nuclear fusion marks the transition to a star.

Stellar evolution varies based on initial mass.

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