  The Chandra X-ray Observatory observed the Crab Nebula and Pulsar during
orbital calibration. Zeroth-order images with the High-Energy Transmission
Grating (HETG) read-out by the Advanced CCD Imaging Spectrometer spectroscopy
array (ACIS-S) show a striking richness of x-ray structure, at a resolution
comparable to that of the best ground-based visible-light observations. The
HETG--ACIS-S images reveal, for the first time, an x-ray inner ring within the
x-ray torus, the suggestion of a hollow-tube structure for the torus, and x-ray
knots along the inner ring and (perhaps) along the inward extension of the
x-ray jet. Although complicated by instrumental effects and the brightness of
the Crab Nebula, the spectrometric analysis shows systematic variations of the
x-ray spectrum throughout the Nebula.
