  The High Energy Transmission Grating (HETG) Spectrometer aboard the Chandra
X-Ray Observatory was used to observe E0102-72, a ~1000 year old, oxygen rich
supernova in the Small Magellanic Cloud. The HETG disperses the image of the
remnant into a spectrum of images in the light of individual X-ray emission
lines. Doppler shifts in the strongest lines of oxygen and neon reveal bulk
motions of up to 2000 km/sec with a complex morphology. Comparison of
progressive ionization stages of magnesium, neon, oxygen and silicon provide
new insights into the mechanism of the `reverse shock' that heats the stellar
ejecta.
