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Extraterrestrial threats to human civilization


    

  Planetary Defense Coordination Office
  
  JPL CIT - Asteroid Watch Planetary Defense Coordination Office. Twitter: @AsteroidWatch
  
  CNEOS is NASA's center for computing asteroid and comet orbits and their odds of Earth impact.
  
  Pan-STARRS - leading Near Earth Object discovery telescopes. Twitter: @AsteroidWatch
  
  Asteroid Rate Jumped in Solar System's Past
  
  Wiki: Comet Swift-Tuttle
  
  Comet Shoemaker-Levy 9 was captured by the gravity of Jupiter, torn apart and then crashed into the giant planet in July 1994.
  
  
  

Comets & Asteroids collisions with Planets

  What the Shoemaker-Levy 9 Impact Taught Us when it crashed into Jupiter in July 1994
  
  Wiki: Shoemaker-Levy 9
  
  Wiki: Chelyabinsk meteor (Near Earth Asteroid) strikes Earth (February 15, 2013)
  
  Professor David Koplow on Planetary Defense: The Asteroid Problem - including legal issues (June 4, 2019)
  
  
  

Intersteller Objects

  Is Oumuamua Really a Comet? The interstellar object Ê»Oumuamua was discovered on Octobter 19, 2017
  
  Non-gravitational acceleration in the trajectory of 1I/2017 U1 (‘Oumuamua) ((June 27, 2018)
  
  Interstellar Comet 2I/Borisov Swings Past Sun, Comet 2I/Borisov is only the second interstellar object known to have passed through the solar system (Dec. 12, 2019) Twitter:
  

News Sources

  Sky & Telescope
  
  
  
  
  
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