The launch of the Chandra (NASA) and XMM-Newton (ESA) X-ray observatories in 1999 has revolutionized our view of the Universe, by providing astrophysical information about many classes of sources with unprecedent detail. The high throughput of XMM-Newton makes it the ideal instrument to provide low to moderate resolution spectroscopy of faint and extended sources. After 3 years of operations, XMM-Newton has observed many types of astronomical sources and delivered very interesting results in many areas. In this review, we highlight a few points where the contribution of XMM-Newton has significantly furthered our knowledge of the energetic Universe.
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