Cambridge X-Ray Astronomy Group - Research of the group focuses on observational studies of active galaxies, clusters of galaxies, elliptical galaxies, and the X-ray background.
Yohkoh Public Outreach Project - Yohkoh satellite is an observatory for studying X-rays and gamma-rays from the Sun. Site features data including movies and a wealth of information about the Sun.
X-Ray Interferometry - Use X-ray interferometry to observe objects in the sky. University of Colorado professor Webster Cash also provides instructions on how to build an X-Ray interferometer.
