posted on Dec, 8 2013 @ 02:59 AM
If the Chelyabinsk meteor fell over the Pacific Ocean or Sahara desert, there would probably be less shouting and waving of hands in panic. In fact,
we'd probably not know about it at all, if there were no one to see it. The Earth is big, 70% of it is oceans, and some of the dry land is very
sparsely populated. So while statistically these things happen fairly often, it doesn't mean big cities will be hit every time.
Check out the case of 2008 TC3: en.wikipedia.org...
It was much smaller than the Chelyabinsk meteor, but was actually discovered 20
hours before impact, and was tracked to its impact site. It exploded tens of kilometers above the ground with the energy of 0.9 to 2.1 kilotons of TNT
over a remote area of the Nubian Desert.
Asteroids with a diameter of 4 meters (like the 2008 TC3) impact Earth approximately once per year. Asteroids with a diameter of 7 meters enter
Earth's atmosphere with as much kinetic energy as Little Boy (the atomic bomb dropped on Hiroshima, approximately 16 kilotons of TNT) about every 5
years, but these ordinarily explode in the upper atmosphere, and most or all of the solids are vaporized. en.wikipedia.org...