Since 1998 when we discovered that the local universe was in
acceleration, the existence of a type of "dark energy" has been verified
by a number of other observations including both distance measurements
and the linear growth of structure at the largest scales in the
Universe. The intrinsic luminosity of thermonuclear explosions of white
dwarfs (Type Ia supernovae) still are the most accurate way to measure
the local acceleration and the equation of state of dark energy. I will
review the latest results in the physics of the explosion of a Type Ia,
the value of the equation of state parameter, and future experiments to
help us understand the nature of this mysterious energy.