Star Birth

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Star Birth

  • medium-sized stars – last for about 10 billion years.
  • small stars may last for 200 billion years.
  • big stars – it have short, fierce lives of 10 million years.
  • stars that begins life in clouds of gas and dust are called nebulae. (photo)
  • inside nebulae – gravity creates dark clumps called EGGs – each clump contains the seeds of a family stars. (example)
    (Wikipedia: EGGS – evaporating gaseous globules.)
  • as gravity squeezes – these globules, they shrink and form hot balls of gas and dust. (video)
  • smaller clumps – don’t get very hot, so they eventually fizzle out. (example)
  • if larger clump – reaches 10’°c million in its core, hydrogen atoms begin to join together in nuclear reactions and the baby star starts to glow.
  • in a medium-sized star such as our Sun, the heat of burning hydrogen pushes gas out as fiercely as gravity pulls inwards, and the star becomes stable (diagram).

Back to  Stars and Galaxies  page


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