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<p>then their present close separation is explained. Short-period systems containing compact objects are sources of <a href="page.php?w=gravitational_waves">gravitational waves</a> and <a href="page.php?w=Type_Ia_supernovae">Type Ia supernovae</a>.</p>

<p>Predictions of the outcome of common-envelope evolution are uncertain.</p>

<p>A common envelope is sometimes confused with a <a href="page.php?w=contact_binary">contact binary</a>. In a common-envelope binary system, the envelope does not generally rotate at the same rate as the embedded binary</p><p>
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