Supernova Pc

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Credit: Night Sky Network:
http://nightsky.jpl.nasa.gov/download-view.cfm?Doc_ID=276

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  • Image: http://maxim.gsfc.nasa.gov/science.html
  • http://chandra.harvard.edu/press/06_releases/press_083006.html
  • Crab Nebula Mosaic from HST Image Credit: NASA , ESA , J. Hester, A. Loll ( ASU ) Acknowledgement: Davide De Martin ( Skyfactory )
  • Nearest SN candidate: Spica
  • Supernova Pc

    1. 1. SUPERNOVA! <ul><li>What is a supernova? </li></ul><ul><li>How dangerous are they to life on Earth? </li></ul><ul><li>How would the universe be different without supernovae? </li></ul>
    2. 2. A hundred years ago, we believed we lived in a quiet, safe universe . . .
    3. 3. <ul><li>Today we know the universe is filled with powerful cosmic radiation our eyes cannot see: </li></ul><ul><li>Gamma-rays </li></ul><ul><li>X-Rays </li></ul><ul><li>Fast-moving atomic </li></ul><ul><li>particles (“Cosmic Rays”) </li></ul>Much of which originates from monstrous black holes in the centers of galaxies and from . . .
    4. 4. . . . neutron stars with powerful magnetic fields and more commonly from . . . <ul><li>Today we know the universe is filled with powerful cosmic radiation our eyes cannot see: </li></ul><ul><li>Gamma-rays </li></ul><ul><li>X-Rays </li></ul><ul><li>Fast-moving atomic </li></ul><ul><li>particles (“Cosmic Rays”) </li></ul>
    5. 5. Supernova!
    6. 6. Where does the radiation come from? Gamma-rays Atomic Particles X-rays
    7. 7. Life of a Butterfly Butterfly Pupa Caterpillar Eggs
    8. 8. Life of a Butterfly
    9. 9. Life of a Sun-like Star Protostars White Dwarf Planetary Nebula Red Giant Sun-like Star Star-Forming Nebula
    10. 10. Life of a Massive Star Protostars Black Hole SUPERNOVA Red Supergiant Massive Star Star-Forming Nebula Neutron Star
    11. 11. SUPERNOVA! Click on image to activate movie
    12. 12. A special effect of a stellar explosion . . .
    13. 13. Gamma-Ray Burst (GRB)!
    14. 14. Is radiation from supernovae and GRB sources dangerous to Earth? How close would they have to be?
    15. 15. Radiation on Earth Radioactive sources emit gamma-rays. If we are too close to a radioactive source, like a chunk of uranium, we cannot see the radiation, but it is still harmful to us! So how far should Earth be from cosmic radiation sources to be safe? Danger - Radioactive!
    16. 16. Death from Exploding Stars?! . Artist’s Conception of the Milky Way Galaxy Location of Solar System
    17. 17. How close would a Supernova have to be? . Location of Solar System
    18. 18. How close would a Supernova have to be? . Location of Solar System
    19. 19. How close would a Supernova have to be to be dangerous? . Supernova: within 30 light years Nearest Supernova Candidate: over 250 light years away! Location of Solar System
    20. 20. How close would a Gamma-Ray Burst (GRB) source have to be? . Location of Solar System
    21. 21. How close would a Gamma-Ray Burst (GRB) source have to be? . GRB Danger Zone: within 8,000 light years Location of Solar System
    22. 22. How close is the nearest Gamma-Ray Burst (GRB) source ? . Our galaxy is about 100,000 light years across Nearest detected GRB source: over a Billion light years away! GRB Danger Zone Location of Solar System
    23. 23. Earth’s Atmosphere & Magnetic Field Protect Earth from most high-energy radiation . . . But prevent us from detecting it here on Earth
    24. 24. The high view: getting a better look GLAST Swift Suzaku XMM-Newton (X-ray Multi-Mirror Mission) X-rays Gamma-rays
    25. 25. Life from Exploding Stars! Scientists have discovered that most of the heavy elements in the universe are dispersed from stars that go supernova. Oxygen
    26. 26. Life from Exploding Stars! Silicon
    27. 27. Life from Exploding Stars! Gold
    28. 28. Life from Exploding Stars! Iron
    29. 29. Life from Exploding Stars! Without supernovae to disperse elements made in stars, there would be no planets, no life as we know it!
    30. 30. <ul><li>Which stars? </li></ul><ul><li>Orion’s stars likely to go supernova! </li></ul>So aren’t you glad we live in a universe where stars explode? 30
    31. 32. <ul><li>What is a supernova? </li></ul><ul><li>How dangerous are they to life on Earth? </li></ul><ul><li>How would the universe be different without supernovae? </li></ul>

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