  We show that a hybrid (nuclear + quark matter) star can have a mass-radius
relationship very similar to that predicted for a star made of purely nucleonic
matter. We show this for a generic parameterization of the quark matter
equation of state, and also for an MIT bag model, each including a
phenomenological correction based on gluonic corrections to the equation of
state. We obtain hybrid stars as heavy as 2 M_solar for reasonable values of
the bag model parameters. For nuclear matter, we use the equation of state
calculated by Akmal, Pandharipande, and Ravenhall using many-body techniques.
Both mixed and homogeneous phases of nuclear and quark matter are considered.
