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<p>Material at the inner edge of the disc falls onto the surface of the white-dwarf primary. A classical <a href="page.php?w=nova">nova</a> outburst occurs when the <a href="page.php?w=density">density</a> and <a href="page.php?w=temperature">temperature</a> at the bottom of the accumulated hydrogen layer rise high enough to ignite <a href="page.php?w=thermal_runaway">runaway</a> <a href="page.php?w=nuclear_fusion">hydrogen fusion</a> reactions, which rapidly convert the hydrogen layer to <a href="page.php?w=helium">helium</a>. If the accretion</p><p>
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