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<p>trajectory is typically computed using <a href="page.php?w=optimal_control">optimal control</a> theory.</p>

<p><big>Assists</big></p>
<p><big>Oberth effect</big></p>
<p>In <a href="page.php?w=astronautics">astronautics</a>, the <b>Oberth effect</b> is where the use of a <a href="page.php?w=rocket_engine">rocket engine</a> when travelling at high speed generates much more useful energy than one at low speed. Oberth effect occurs because the <a href="page.php?w=propellant">propellant</a> has more usable energy (due to its kinetic energy on top of its chemical potential</p><p>
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