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<p>the <a href="page.php?w=Solar_System">Solar System</a> (Scorpius X-1). It is now known that such X-ray sources as Sco X-1 are <a href="page.php?w=compact_star">compact star</a>s, such as <a href="page.php?w=neutron_star">neutron star</a>s or <a href="page.php?w=black_hole">black hole</a>s. Material falling into a black hole may emit X-rays, but the black hole itself does not. The energy source for the X-ray emission is <a href="page.php?w=gravity">gravity</a>. Infalling gas and dust is heated by the strong <a href="page.php?w=gravitational_fields">gravitational fields</a></p><p>
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