String Theory and Newton’s Law of Gravity String Theory and The
Hierarchy Problem in Physics A Quick Look at String Theory
String Theory: Moving through Space-Time  Understanding how time
travel works within string theory would require a complete
understanding of how the fabric of space-time behaves within the
theory. So far, string theory hasn’t exactly figured that out.
In general relativity, the motion of objects through space-time
is described by a worldline. In string theory, scientists talk
about strings (and branes) creating entire worldsheets as they
move through space-time.  Worldlines were originally constructed
by Hermann Minkowski when he created his Minkowski diagrams.
Similar diagrams return in the form of Feynman diagrams, which
demonstrate the worldlines of particles as they interact with
each other through the exchange of gauge bosons.  In string
theory, instead of the straight worldlines of point particles,
it is the movement of strings through space-time that interests
scientists, as show