#ChelyabinskMeteorFirstAnniversary

 

http://sulia.com/channel/space-astronomy/f/5f10b855-5292-49ee-908b-74d842162df4/?action=prop&source=fb&form_factor=desktop

http://www.popularmechanics.com/science/space/telescopes/the-asteroid-threat-visualized-16490560

 

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