Abstract
Superstrings being consistent theories that include gravity have to produce classical gravity within limits provided by unambiguous quantum effects. Through the study of a hard scattering process — clearly provided by string theory — it is shown that infinite genus calculations give indeed rise to a classical limit, when “large” distances are explored, as well as quantum effects. These are dominant at distances of the order of the string length (related to the Planck langth) but may extend much beyond that region hinting indeed to gravitational instabilities. Below the string length even space-time loses meaning as a classical concept. A new position-momentum uncertainty relation is produced that assigns to the string length the meaning of a minimum observable distance.
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