There are hundreds of space objects flying around in space, 24/7/365 and several thousand of them are hurtling towards earth... Most of them burn out in our atmosphere but many don't and have impacted the earth with the force of a hundred megaton bombs, one such crater is the Gorangosa crater in Africa. This video was made to describe NASA'S countermeasures or contingency plan.
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From @tranquilpen
In #asteroids