  Measurements of stellar mass loss rates are used to assess how wind strength
varies with coronal activity and age for solar-like stars. Mass loss generally
increases with activity, but we find evidence that winds suddenly weaken at a
certain activity threshold. Very active stars are often observed to have polar
starspots, and we speculate that the magnetic field geometry associated with
these spots may be inhibiting the winds. Our inferred mass-loss/age relation
represents an empirical estimate of the history of the solar wind. This result
is important for planetary studies as well as solar/stellar astronomy, since
solar wind erosion may have played an important role in the evolution of
planetary atmospheres.
