THE SLITHER IN THE MIDDLE. Life is trapped between the infinitesimally tiny and the astronomically gargantuan in a a tiny slither of scale 10(-6) to 10(2). The smallest thing in existence, the Planck Particle, is 1.5 x 10(-34) meters. Living things range from 1 x10(-7) meters (a virus) to 1 x 10(2) meters (a blue whale); the estimated entire, but expanding, universe is a staggering 1 x 10(27) meters. (Nikon’s lovely interactive graphic).
http://www.nikon.com/about/sp/universcale/scale.htm