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<p>discussed in <a href="page.php?w=theoretical_physics">theoretical physics</a> that relies on the creation of <a href="page.php?w=closed_timelike_curve">closed timelike curve</a>s (CTCs). <a href="page.php?w=Paul_J._Nahin">Paul J. Nahin</a> distinguishes between "weak" time machines that exploit existing CTCs and "strong" time machines that are themselves responsible for the creation of the CTCs.</p>

<p><big> Related concepts </big></p>
<p><a href="page.php?w=Brave_New_Words">Brave New Words</a>: The Oxford Dictionary of Science Fiction and <a href="page.php?w=The_Encyclopedia_of_Science_Fiction">The Encyclopedia of Science Fiction</a></p><p>
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