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This question already has an answer here:

As far as I understand, gravity wells prevent hyperspace travel.

What's the in-universe explanation for how Han was able to hyperspace travel through the First Order's shields, and even land successfully, in The Force Awakens?

marked as duplicate by KutuluMike, BMWurm, Jason Baker, Jack B Nimble, NKCampbell Jan 14 '16 at 20:53

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Han Solo explains how the Millennium Falcon (and any ship travelling at lightspeed) can get through the First Orders defensive shielding (As Admiral Ackbar calls it)

He refers to it as a "fractional refresh rate" which means that rather than being a continuous wall of energy, it is produced in pulses (from the shield generator) and every X amount of time, there is a small window of opportunity to pass through it, but of course, you have to be going really fast meaning lightspeed or more.

I'd like to add, that the duplicate answer marked in the question does not correctly answer this question and in fact just speculates. There is however, correct answers here:

Why couldn't the shield protecting the Death Star be penetrated at the Battle of Endor?

As I said, the shield fluctuates/flickers/pulsates meaning for a fraction of a second, they are down, and so a ship can pass through.

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As far as I know, Star Wars hyperdrive can take a ship anywhere in realspace via hyperspace, as long as the calculations are done correctly. Gravity wells and shielding, at least in current canon, aren't known to affect the hyperspace dimension, as far as actual travel goes, because hyperspace is an entirely different dimension from realspace. The reason we usually don't see pilots doing this kind of maneuver is because without the proper calculations, it's extremely dangerous due to the massive scale and speed involved with this kind of travel, so they take established hyperspace routes. Han was stupidly gambling his life, along with the entire Resistance, by trying to go to lightspeed without the proper calculations, but it's completely possible to do with enough luck.

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    It's debatable whether risking a handful of lives in an attempt to save millions is stupid. – Peregrine Rook Jan 14 '16 at 19:54
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    I agree. I didn't mean to imply that Han Solo's actions were stupid, I simply wanted to emphasize that it was a risky and foolhardy gamble given the odds of making a mistake. – Dzvfars Fdszvfvf Jan 14 '16 at 20:05
  • I wouldn't say it was foolhardy. That implies that his trying and failing would leave the Resistance (or himself) in a worse position than if he didn't try at all. From Han's perspective, failure just means dying slightly sooner (assuming that we wasn't giving option 3--running off--any serious consideration) than if he doesn't try at all. – chepner Jan 15 '16 at 19:30

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