Star Wars tie-ins have finally explained the hyperspace tracking seen in Star Wars: The Last Jedi. The destruction of Starkiller Base should have been the Resistance's greatest hour. Instead, the next few days saw the Resistance come close to destruction. As seen in Star Wars: The Last Jedi, the First Order launched a Blitzkrieg across the galaxy, destroying what was left of the New Republic. Their forces then pressed in on the Resistance, forcing them to flee to an abandoned Rebel Alliance base on Crait.
The key to the First Order's success lay in hyperspace tracking. This technology had long been thought impossible, but an Easter egg in Rogue One: A Star Wars Story confirmed the Empire had been working on it on the planet Scarif. There have since been subtle hints the tracking technology may have somehow involved emissions from a hyperdrive; Lucasfilm's Star Wars: The Rise of Skywalker Visual Dictionary confirmed that was how Darth Vader tracked the Tantive IV in the first Star Wars film, with a faulty hyperdrive meaning its emissions were particularly distinctive. It's possible the Tantive IV was deliberately sabotaged, given the Organas were known to be connected to various Rebel cells.
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Adam Christopher's latest Star Wars novel, Shadow of the Sith, finally explains how hyperdrive tracking works. It reveals agents of a Sith cult known as the Acolytes of the Beyond managed to steal samples of the technology before the Death Star destroyed Scarif, and they'd actually been able to use it. According to Luke Skywalker, the technique is best known as hyperwave signal interception. This "involves mapping the energy signatures of ships as they
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