Newtonian telescope - Wikipedia
XMM-Newton — Wikipédia
XMM-Newton - Wikipedia
An Aging Pulsar has Captured a new Companion, and it's Spinning back up Again - Universe Today
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XMM-Newton - Wikipedia
XMM-Newton | Description, Discoveries, & Facts | Britannica
XMM-Newton - Wikipedia
XMM-Newton — Wikipédia
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ESA - XMM-Newton overview
XMM-Newton | Description, Discoveries, & Facts | Britannica
ESA Science & Technology - XMM-Newton
ESA - XMM-Newton overview
Space telescope - Wikipedia
XMM-Newton — Wikipédia
X-ray Satellite XMM-Newton Celebrates 20 Years in Space | NASA
