Giant balls of metal spotted falling from the sky in different parts of the world have left people baffled. Brits, Russians and now Peruvians have spotted fireballs plummeting into their local ...

If you drop a sphere, then the area is the cross sectional area---so the area of a circle with the same radius ... So, let's think about a ball falling from rest. Perhaps we can look at three ...

They are not watching for ordinary ice storms or slick roads, but incidents involving "megacryometeors," great balls of ice that fall out of the clear blue sky -- possibly because of global warming.