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Supernova Pc

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Credit: Night Sky Network:

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 Supernova Pc Presentation Transcript

  • SUPERNOVA!
    • What is a supernova?
    • How dangerous are they to life on Earth?
    • How would the universe be different without supernovae?
  • A hundred years ago, we believed we lived in a quiet, safe universe . . .
    • Today we know the universe is filled with powerful cosmic radiation our eyes cannot see:
    • Gamma-rays
    • X-Rays
    • Fast-moving atomic
    • particles (“Cosmic Rays”)
    Much of which originates from monstrous black holes in the centers of galaxies and from . . .
  • . . . neutron stars with powerful magnetic fields and more commonly from . . .
    • Today we know the universe is filled with powerful cosmic radiation our eyes cannot see:
    • Gamma-rays
    • X-Rays
    • Fast-moving atomic
    • particles (“Cosmic Rays”)
  • Supernova!
  • Where does the radiation come from? Gamma-rays Atomic Particles X-rays
  • Life of a Butterfly Butterfly Pupa Caterpillar Eggs
  • Life of a Butterfly
  • Life of a Sun-like Star Protostars White Dwarf Planetary Nebula Red Giant Sun-like Star Star-Forming Nebula
  • Life of a Massive Star Protostars Black Hole SUPERNOVA Red Supergiant Massive Star Star-Forming Nebula Neutron Star
  • SUPERNOVA! Click on image to activate movie
  • A special effect of a stellar explosion . . .
  • Gamma-Ray Burst (GRB)!
  • Is radiation from supernovae and GRB sources dangerous to Earth? How close would they have to be?
  • 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!
  • Death from Exploding Stars?! . Artist’s Conception of the Milky Way Galaxy Location of Solar System
  • How close would a Supernova have to be? . Location of Solar System
  • How close would a Supernova have to be? . Location of Solar System
  • 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
  • How close would a Gamma-Ray Burst (GRB) source have to be? . Location of Solar System
  • How close would a Gamma-Ray Burst (GRB) source have to be? . GRB Danger Zone: within 8,000 light years Location of Solar System
  • 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
  • Earth’s Atmosphere & Magnetic Field Protect Earth from most high-energy radiation . . . But prevent us from detecting it here on Earth
  • The high view: getting a better look GLAST Swift Suzaku XMM-Newton (X-ray Multi-Mirror Mission) X-rays Gamma-rays
  • Life from Exploding Stars! Scientists have discovered that most of the heavy elements in the universe are dispersed from stars that go supernova. Oxygen
  • Life from Exploding Stars! Silicon
  • Life from Exploding Stars! Gold
  • Life from Exploding Stars! Iron
  • Life from Exploding Stars! Without supernovae to disperse elements made in stars, there would be no planets, no life as we know it!
    • Which stars?
    • Orion’s stars likely to go supernova!
    So aren’t you glad we live in a universe where stars explode? 30
  •  
    • What is a supernova?
    • How dangerous are they to life on Earth?
    • How would the universe be different without supernovae?