MAXIM - MicroArcsecond X-Ray Imaging Mission
- The vision, mission, the science, pathfinder, resource, documents, what's new, and contacts.
- http://maxim.gsfc.nasa.gov/

Strasbourg Astronomical Observatory
- News, responsibilities, activities, document, and links.
- http://astro.u-strasbg.fr/Obs-e.html

Instrumentation: X-ray Multi-Mirror (XMM) Observatory
- Information for teachers, x-ray astronomy, telescopes, images, spacecraft, astrophysics, and the laboratory.
- http://www.sr.bham.ac.uk/instrument/xmm.html

X-ray Data Reveal Black Holes Galore
- Article by Ron Cowen.
- http://www.sciencenews.org/articles/20000115/fob1.asp

XMM-Newton Science Operations Centre
- News, observer's information, scheduling, support, software and calibration, data access, science, and news.
- http://xmm.vilspa.esa.es/

The USA Experiment
- Introduction, news, technical specifications, gallery, observations, data analysis, publications, and links.
- http://xweb.nrl.navy.mil/usa/

Chandra X-ray Observatory
- Data analysis, instruments and calibration, links, target and scheduling, users, newsletters.
- http://asc.harvard.edu/

ASCA Guest Observer Facility
- About ASCA, services, what's new, data processing, timelines and mission, gallery, and related sites.
- http://heasarc.gsfc.nasa.gov/docs/asca/