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<p>evolution, and the formation of the heavy elements in the Universe.</p>

<p>The technology required for the follow-on project of XEUS, the <a href="page.php?w=International_X-ray_Observatory">International X-ray Observatory</a>, eventually leading to <a href="page.php?w=Advanced_Telescope_for_High_Energy_Astrophysics">Advanced Telescope for High Energy Astrophysics</a> (<a href="page.php?w=Athena">Athena</a>) which is currently under development. XEUS was one of the candidates for the <a href="page.php?w=Cosmic_Vision">Cosmic Vision programme</a></p><p>
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