8th Grade-Ch. 4 Sec. 2 Characteristics of Stars

4,046 views

Published on

Published in: Education, Technology
0 Comments
4 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
4,046
On SlideShare
0
From Embeds
0
Number of Embeds
12
Actions
Shares
0
Downloads
281
Comments
0
Likes
4
Embeds 0
No embeds

No notes for slide

8th Grade-Ch. 4 Sec. 2 Characteristics of Stars

  1. 1. CH. 4 Sec. 2 Characteristics of Stars
  2. 2. constellation <ul><li>pattern of stars in sky </li></ul>
  3. 3. Orion the Hunter
  4. 4. Can you identify these constellations? 3. 1. 2. 4. Cygnus the Swan Pisces the Fish Gemini the Twins Hydra the Snake
  5. 5. Main characteristics Used to Classify stars
  6. 6. main characteristics used to classify stars Color Temp. size chemical composition brightness
  7. 7. color & temp. <ul><li>star’s color tells its temp. </li></ul><ul><li>range from hottest  coolest </li></ul><ul><ul><li>blue or blue - white  red </li></ul></ul>
  8. 8. Colors and Temperatures of Stars video clip
  9. 9. size <ul><li>smallest  largest: </li></ul><ul><li>neutron star </li></ul><ul><li>white dwarf star </li></ul><ul><li>medium-sized star </li></ul><ul><li>giant star </li></ul><ul><li>supergiant star </li></ul>
  10. 11. spectrograph <ul><li>breaks light into colors & produces image of resulting spectrum </li></ul><ul><li>tells stars: </li></ul><ul><ul><li>chemical composition </li></ul></ul><ul><ul><li>temperature </li></ul></ul>
  11. 12. <ul><li>amount of light given off </li></ul><ul><li>depends on size & temp. </li></ul><ul><li>described in 2 ways : </li></ul>brightness
  12. 13. apparent brightness <ul><li>brightness as seen from Earth </li></ul>
  13. 14. absolute brightness <ul><li>brightness star would have if it were @ standard distance from Earth </li></ul>The streetlights in this photo all give off about the same amount of light, and so have about the same absolute brightness.
  14. 15. light year <ul><li>distance that light travels in 1 year </li></ul><ul><li>= 9.5 million million (trillion) km </li></ul>
  15. 16. You and your friend are sitting behind a woman with a large hat. Why is your view of the screen different from your friend’s view? Parallax at the Movies
  16. 17. parallax <ul><li>method astronomers use to measure distances to nearby stars </li></ul><ul><li>apparent change in position of an object when you look @ it from different places </li></ul>
  17. 18. Why do nearby stars appear to change position between January and July?
  18. 19. <ul><li>graph that shows relationship between </li></ul><ul><li>surface temp. & brightness </li></ul><ul><li>most stars= main sequence- diagonal line </li></ul><ul><li>in ctr. of graph </li></ul>Hertzsprung-Russell Diagram
  19. 21. The constellation, Orion includes the red supergiant Betelgeuse, the blue supergiant Rigel, and many other main sequence and giant stars.

×