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Lives of Stars

Lives of Stars. Stars begin as gas and dust called a nebula. Gravity pulls the gas and dust in and fusion begins. This forms a Protostar or ‘new star’. Protostar. Lifetimes of Stars. A star’s life depends on its mass. Stars smaller than the sun live up to 200 billion years.

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Lives of Stars

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  1. Lives of Stars Stars begin as gas and dust called a nebula. Gravity pulls the gas and dust in and fusion begins. This forms a Protostar or ‘new star’

  2. Protostar

  3. Lifetimes of Stars • A star’s life depends on its mass. • Stars smaller than the sun live up to 200 billion years. • Medium sized stars like the sun live around 10 billion years. • Stars 15 times more massive than the sun live about 10 million years.

  4. Star Life Cycle • Nebula • Protostar • Main Sequence: 90% of stars. Hydrogen continues to burn and fuse to make helium.

  5. MAIN SEQUENCE

  6. Giant/Super Giant: The star begins to run out of fuel. The star expands. • Supernova: Massive stars can blow up to an enormous size.

  7. mass RED GIANT

  8. Small and Medium Stars • These become giants and then White Dwarfs: blue-white core of a star that is left behind. These have no fuel, but glow faintly from left over energy. When a white dwarf burns out, it is dead. Then it is a Black Dwarf.

  9. fusion WHITE DWARF PULSAR

  10. Super Giants: • When a Super Giant explodes into a supernova, it can become 2 things: • A. Neutron Star: Smaller and more dense than a white dwarf. They have 3 times as much mass as the sun, but are about the size of Houston! • Black Hole: This object is so dense, not even light can escape the gravity field.

  11. SUPERNOVA explosion Super Nova

  12. BLACK HOLE : http://chandra.harvard.edu/photo/2004/rxj1242/index.html

  13. Nebula  Protostar  Main Sequence  Giant or Supergiant White DwarfSupernova Neutron Star Black Dwarf OR Black Hole

  14. Binary Star Systems • Stars that revolve around each other. • Sometimes this causes stars to appear as if they are blinking

  15. Let’s Review! 1. All stars begin as gas and dust called • Protostar • Nebula • White dwarf

  16. 2. Most stars are in this stage a. Protostar b. White Dwarf c. Main Sequence

  17. 3. The life of a star depends on its a. Color b. Place in the universe c. Mass

  18. 4. If the star is super massive, it will live longer. a. True b. False

  19. 5. Low mass stars will become black holes a. True b. False

  20. 6. An object so dense, not even light can escape. a. Supernova b. Main Sequence c. Black Hole d. Nebula

  21. 7. A new star where fusion begins. a. Protostar b. Neutron Star c. Main Sequence

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