Outline
1. What you need to know:
a. X-rays from the Sun - magnetic activity, x-ray spectra
b. Hot stars
c. Radiation-driven winds and the Doppler shift
d. The holy grail of science: a measurement that can discriminate between two contradictory theories
2. What we have observed/measured with the new generation of high-resolution x-ray telescopes
3. Our empirical model and fits to the data
4. An answer…and more questions