Space seems to be falling all around us lately. A geologic chunk about 55 feet wide (17 meters wide) with a mass of about 10,000 tons entered Earth atmosphere two weeks ago near Chelyabinsk, Russia and exploded with a force 20 times that of the bomb dropped on Hiroshima in WWII. At the same time, another asteroid, 150-foot-wide (45-meter-wide) passed within only 17,000 miles of Earth, inside the orbits of many of our satellites, that is, within our technology space, a virtual cosmic grazing. Not to worry, though, the smaller ones happen every century or so, but a big one does not happen for millennia.