title: The high energy X-ray universe.
abstract: Since its beginning in the early 1960s, the field of X-ray astronomy has exploded, experiencing a ten-billion-fold increase in sensitivity, which brought it on par with the most advanced facilities at all wavelengths. I will briefly describe the revolutionary first discoveries prior to the launch of the Chandra and XMM-Newton X-ray observatories, present some of the current achievements, and offer some thoughts about the future of this field.
authors.affiliation: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA. giacconi@pha.jhu.edu
authors.forename: Riccardo
authors.initials: R
authors.lastname: Giacconi
references.citation: Astrophys J. 2000 Mar 1;531(1):L9-L12
references.pmid: 10673402
references.citation: Astrophys J. 2000 Jun 20;536(2):L81-L84
references.pmid: 10859123