Neutron Star Formation and Basic Properties

• Born from death of large stars 10-29 times mass of Sun
• Formation process:
  • Fusion in core stops → supernova explosion
  • Core collapses under gravity
  • Electrons + protons forced together → become neutrons
• Physical characteristics:
  • Mass: 1-2 suns compressed into 20km diameter (size of Manhattan)
  • Density: thimble full = 100 million tons = 15 Great Pyramids of Giza = 70 million Toyota Corollas
  • Rotation: fastest discovered PSR J1748-2446ad rotates 716 times/second (24% speed of light at surface)

Magnetars: Extreme Neutron Stars

• Small percentage of neutron stars born as magnetars
• Magnetic field comparison:
  • Regular neutron stars: 2 trillion times Earth's magnetic field
  • Magnetars: 1,000 times more powerful than neutron stars
  • Most powerful magnets in known universe
• Dangerous proximity effects:
  • 160,000km away: strips information from all credit cards on Earth
  • 1,000km away: magnetic field warps atoms into thin rod shapes, dissolves body at atomic level, makes molecular chemistry impossible

Star Quakes and Radiation Events

• Magnetar crust (made of neutrons) can crack like tectonic plates
• Cracks only micrometers long but release massive radiation blasts
• Notable event: SGR 1806-20 magnetar (50,000 light-years away)
  • 2004 star quake reached Earth
  • Brightest event from outside solar system ever witnessed by humans
  • Largest explosion in galaxy since 1604 supernova (observed by Johannes Kepler)
  • Released more energy in 0.1 seconds than Sun releases in 100,000 years
• Hypothetical closer magnetar (10 light-years away):
  • Would destroy Earth's ozone layer
  • Would destroy most surface life on Earth
  • No advance warning possible

Safety and Current Status

• Closest known magnetar: 9,000 light-years from Earth
• Safe distance allows fascination rather than fear