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Stars
Temperature <ul><li>Hot = blue star  </li></ul><ul><li>(about 30,000 o ) </li></ul><ul><li>Cool = red star  </li></ul><ul>...
Constellation Orion
Brightness <ul><li>Apparent Magnitude  (m) </li></ul><ul><ul><li>- The brightness of a star from a specific location </li>...
Brightness <ul><li>The lower the number the brighter the star </li></ul><ul><li>Example:  </li></ul><ul><li>-1 is brighter...
Big Dipper
Stellar Evolution <ul><li>Nebula  - a cloud of dust and gases - the birthplace of stars -”molecular cloud” </li></ul>
Eagle Nebula
 
 
Stellar Evolution <ul><li>Protostar  -  </li></ul><ul><li>before a real star </li></ul><ul><li>temperature increasing </li...
Stellar Evolution <ul><li>Main Sequence Star -  fusion has begun in the core; average size & temp.; H fuses to HE </li></ul>
Sun
Stellar Evolution <ul><li>Giant  or  </li></ul><ul><li>Super-giant  -  all H has been fused - now fusing Helium - star beg...
From a Giant <ul><li>Planetary Nebula </li></ul><ul><ul><li>All Helium gone </li></ul></ul><ul><ul><li>Outer gases of star...
… from a Planetary Nebula <ul><li>White Dwarf  -  shrinking star </li></ul><ul><li>… then… </li></ul><ul><li>*(smallest st...
… from a Supergiant <ul><li>Supernova  - collapse & violent explosion </li></ul>
 
…from a Supernova  <ul><li>*(smaller large stars)  </li></ul><ul><li>Neutron Star  - extremely small, dense rotating star ...
All visuals are from : “ Astronomy Picture of the Day” from NASA found at: http://antwrp.gsfc.nasa.gov/apod/
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Stars

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This slide show on the stars gives a basic introduction at the high school level.

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Transcript of "Stars"

  1. 1. Stars
  2. 2. Temperature <ul><li>Hot = blue star </li></ul><ul><li>(about 30,000 o ) </li></ul><ul><li>Cool = red star </li></ul><ul><li>(about 2500 o ) </li></ul><ul><li>Sun = yellow star </li></ul><ul><li>(about 6000 o ) </li></ul>
  3. 3. Constellation Orion
  4. 4. Brightness <ul><li>Apparent Magnitude (m) </li></ul><ul><ul><li>- The brightness of a star from a specific location </li></ul></ul><ul><li>Absolute Magnitude (M) </li></ul><ul><ul><li>- The brightness of a star from 10 parsecs away (32.6 light-years) </li></ul></ul>
  5. 5. Brightness <ul><li>The lower the number the brighter the star </li></ul><ul><li>Example: </li></ul><ul><li>-1 is brighter than 5 </li></ul>
  6. 6. Big Dipper
  7. 7. Stellar Evolution <ul><li>Nebula - a cloud of dust and gases - the birthplace of stars -”molecular cloud” </li></ul>
  8. 8. Eagle Nebula
  9. 11. Stellar Evolution <ul><li>Protostar - </li></ul><ul><li>before a real star </li></ul><ul><li>temperature increasing </li></ul>
  10. 12. Stellar Evolution <ul><li>Main Sequence Star - fusion has begun in the core; average size & temp.; H fuses to HE </li></ul>
  11. 13. Sun
  12. 14. Stellar Evolution <ul><li>Giant or </li></ul><ul><li>Super-giant - all H has been fused - now fusing Helium - star begins to expand & cool </li></ul>
  13. 15. From a Giant <ul><li>Planetary Nebula </li></ul><ul><ul><li>All Helium gone </li></ul></ul><ul><ul><li>Outer gases of star drift away </li></ul></ul><ul><ul><li>Remaining gases collapse forming next stage </li></ul></ul>
  14. 16. … from a Planetary Nebula <ul><li>White Dwarf - shrinking star </li></ul><ul><li>… then… </li></ul><ul><li>*(smallest stars ) Black Dwarf - fades away </li></ul><ul><li>OR </li></ul><ul><li>*(larger small stars) Nova - explosion </li></ul>
  15. 17. … from a Supergiant <ul><li>Supernova - collapse & violent explosion </li></ul>
  16. 19. …from a Supernova <ul><li>*(smaller large stars) </li></ul><ul><li>Neutron Star - extremely small, dense rotating star </li></ul><ul><li>OR </li></ul><ul><li>*(largest stars) </li></ul><ul><li>Black Hole - so dense even light can not escape </li></ul>
  17. 20. All visuals are from : “ Astronomy Picture of the Day” from NASA found at: http://antwrp.gsfc.nasa.gov/apod/
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