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Life Cycle of a Star

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Life Cycle of a Star
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  • Hi! I'm Rick. Do you see those stars behind me? This is the story of how stars like those came to life. How the universe gave birth to amazing radiant bodies known as stars.
  • Rick's Life in Outer Space:Life Cycle of Stars
  • Stellar Nebula: Stage 1
  • When knots within thenebula contain sufficient mass in the form of gas and dust, it begins to collapse from gravitational attraction.
  • As it collapses, pressure from gravity heats upmaterials in the centre. This creates what is known as a protostar.
  • When the core hassufficient heat to ignite infusion, a star is formed.
  • The stars shines steadily until the hydrogen has all fused to form helium, thus depleting its fuel and turning into a red supergiant. (millions of years)
  • Massive stars are stars that larger than 8 solar masses (3-50X sun's mass).
  • Massive Star: Stage 2
  • These stars are in the prime of life and are born from stellar nebulae. It has a surface temperature of around 40,000K
  • The red supergiant has a helium core surrounded by a shell of cooling, expanding gas with a surface temperature of 4,100K.
  • Red supergiants has the largest radius of all types of stars.
  • More cool than massive stars (red). It also forms different elements when it runs out of hydrogen to use as fuel.
  • Red Supergiant: Stage 3
  • Supernova: Stage 4
  • This causes an explosion known as a supernova in which a shock wave blows the outer layer of the star into space.
  • The core of a red supermassive collapses rapidly, taking less than 1 second to collapse.
  • Gravity collapses the star and the light from the supernova can out shine galaxies for a few days or even months!
  • If the core of the star survives the supernova and has a mass of greater than 3 solar masses, the core becomes a black hole.
  • Fun fact: If you fall into a stellar black hole, you would last a fraction of a second. However, for a supermassive black hole, you may last a few hours.
  • A Black hole has extremely an extremely intense gravitational pull which sucks all matter and light, making it invisible.
  • Black Hole: Stage 5
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