  The discovery of the Higgs boson at the LHC exposes some of the most profound
mysteries fundamental physics has encountered in decades, opening the door to
the next phase of experimental exploration. More than ever, this will
necessitate new machines to push us deeper into the energy frontier. In this
article, we discuss the physics motivation and present the physics potential of
a proton-proton collider running at an energy significantly beyond that of the
LHC and a luminosity comparable to that of the LHC. 100 TeV is used as a
benchmark of the center of mass energy, with integrated luminosities from 3
inverse ab to 30 inverse ab.
