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Lifecycle of a Star

Lifecycle of a Star. /Act One/. The Life of a Small to Medium Mass Star. Nebula - cloud of gas & dust. Protostar. Small Protostar…. Brown Dwarf Too small to create enough heat to start fusion. or. Main Sequence Star. The protostar gains enough mass to begin fusion.

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Lifecycle of a Star

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  1. Lifecycle of a Star

  2. /Act One/ The Life of a Small to Medium Mass Star

  3. Nebula- cloud of gas & dust

  4. Protostar

  5. Small Protostar… Brown Dwarf Too small to create enough heat to start fusion

  6. or

  7. Main Sequence Star The protostar gains enough mass to begin fusion. All main sequence stars fuse hydrogen

  8. Red Giant Small to medium main sequence star runs out of hydrogen & begins fusing helium

  9. Planetary Nebula A Red Giant completely stops fusing & the outer layers of the star are driven away

  10. White Dwarf The left over core of a star. A white dwarf may only be the size of Earth, but it has a mass equal to ½ of the Sun.

  11. Black Dwarf A white dwarf cools off over trillions of years until it no longer emits light

  12. /Act Two/ The Life of a High Mass Star

  13. Nebula- cloud of gas & dust

  14. Protostar

  15. Massive Main Sequence Star Massive main sequence stars fuse hydrogen much faster than small or medium stars

  16. Red Supergiant Massive main sequence star runs out of hydrogen & begins fusing helium, carbon, oxygen, etc.

  17. Supernova Fusion stops. The star collapses & creates a huge explosion.

  18. Neutron Star Super dense core of a star left over after a supernova. Only 5 to 15 MILES in diameter, but have a mass 1.5 – 2 times that of the Sun.

  19. or

  20. Black Hole Stars with masses of 25 to 50 times of the Sun form black holes after a supernova. The leftover core of the star is so dense that it causes gravitational collapse.

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