It's Asteroid Day
A diagram illustrating the difference of opinion between ambit of a typical near - Earth asteroid ( blue ) and a potentially wild asteroid , or PHA ( orange ) . PHAs are a subset of the near - Earth asteroids ( NEAs ) and have the closest area to Earth ’s orbital cavity , coming within 5 million knot . Image credit : NASA / JPL - Caltech Today , June 30 , isAsteroid Day , an upshot organized by uranologist , planetary scientists , astrophysicist , and others to raise cognizance of our possible doomsday by way of giant rocks from space ....