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<p>observations are crucial for understanding the structure and evolution of the <a href="page.php?w=star">star</a>s, <a href="page.php?w=Galaxy">galaxies</a>, and the <a href="page.php?w=Universe">Universe</a> as a whole. X-ray images reveal hot spots in the Universe - regions where particles have been energized or raised to very high temperatures by strong <a href="page.php?w=magnetic_fields">magnetic fields</a>, violent explosions, and intense <a href="page.php?w=Gravitation">gravitational forces</a>. X-ray sources in the sky are also associated</p><p>
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