5 links
Chandra X-ray Observatory
chandra.nasa.gov
Orbiting observatory that opens a window for the most detailed X-ray view of the universe.
Chandra X-ray Observatory
chandra.harvard.edu
Public information and education, and scientific user support.
Chandra X-ray Observatory
asc.harvard.edu
Data analysis, instruments and calibration, links, target and scheduling, users, newsletters.
Chandra X-ray Observatory
chandra.harvard.edu
Part of NASA's collection of space observatories. This one specializes in x-ray technology.
Instrumentation: X-ray Multi-Mirror (XMM) Observatory
sr.bham.ac.uk
Information for teachers, x-ray astronomy, telescopes, images, spacecraft, astrophysics, and the laboratory.