Recently reading the Scientific American article The Black Hole at the Beginning of Time, which at first glance made me wonder if they were bowing to pressure to increase circulation, did however get me to thinking about Inflation and Graceful Exit, a rather major problem. I understand that Stephen Hawking and Werner Israel postulate that the limits on our ability to measure wavelengths is roughly from 10^-7 to 10^11 Hz. I'm pretty sure I can see why those are presently limitations on our ability to measure, but is there any known reason that much larger wavelengths can not exist? say, 10^-18? Further then, is it impossible, that oscillating epochs might exist based on extremely long (to us) wave periods?