  In this article, we explore the cooling of isolated quark stars. These
objects are structured of a homogeneous quark matter core and crusted by
matter. To do this, we adopt two kinds of crust: (i) a crust made of purely
nuclear matter following the Baym-Pethick-Sutherland (BPS) equation of state
(EoS) and (ii) a crust made of nuggets of strange quark matter (strangelets).
Both models have the same quark matter core described by the MIT bag model EoS.
Our main purpose is to quantify the effects of a strangelet crust on the
cooling and relaxation times of these strange stars. We also perform a thorough
study of the thermal relaxation of quark stars, in which we have found that
objects with a strangelet crust have a significantly different thermal
relaxation time. Our study also includes the possible effects of color
superconductivity in the quark core.
