  Neutron stars and quark stars are not only characterized by their mass and
radius, but also by how fast they spin, through their moment of inertia, and
how much they can be deformed, through their Love number and quadrupole moment.
These depend sensitively on the star's internal structure, and thus on unknown
nuclear physics. We find universal relations between the moment of inertia, the
Love number and the quadrupole moment that are independent of the neutron
star's and quark star's internal structure. These can be used to learn about
the deformability of these compact objects through observations of the moment
of inertia, break degeneracies in gravitational wave detection to measure spin
in binary inspirals and test General Relativity in a nuclear-structure
independent fashion.
