In a well-known scene in A New Hope, a rebel analyst describes the Death Star's weakness: "A small thermal exhaust port, right below the main port."

What is the "main port?"

Rebel Briefing

  • 3
    The main thermal exhaust port? Oct 27, 2022 at 23:58
  • 2
    I have a vague memory of this being better explained in one of the early adaptations, but I can't find it in the earlier scripts, the novelization, the comic book adaptation, or the radio adaptation.
    – Buzz
    Oct 28, 2022 at 3:31

1 Answer 1


That would be the Main Exhaust Port, noting that the weakness in the Death Star was an unshielded secondary port.

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Star Wars: Blueprints - The Ultimate Collection


“I understand that it’s on the plans. What I’m saying is I don’t want you to build it. It doesn’t make any sense to put a heat exhaust port there. The main exhaust port is already done, and if there is a need for additional ones-which I don’t believe there is, at all - there are better places to put them than right next to the main one. We don’t need it in this sector, and certainly not there.” She pointed at the holo schematic of the polar trench.

Star Wars: Death Star

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    Is she doubting the flawless design work of Galen Erso?!?!? Oct 28, 2022 at 10:38
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    Is there also any detail about what is exhausted there? I mean the Death Star is meant to be operated in space, so I feel "hot air" is not really an answer there.
    – kopaka
    Oct 28, 2022 at 12:19
  • 6
    @kopaka Actually, getting rid of excess heat is a major problem for real life space vessels, so it's not implausible. Though hot air might not be correct. In reality, this is typically done with large radiator arrays, not with just a hole. Star Wars physics isn't exactly scientifically rigorous of course. Oct 28, 2022 at 14:16
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    @kopaka - The Rogue One novelisation contains a considerable amount of information about what's exhausted. In short, a mixture of heat and radiation. Feel free to ask it as a proper question though, to get a proper answer :-)
    – Valorum
    Oct 28, 2022 at 14:20
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    @PaulD.Waite Of course not! It's Legends, so she's doubting the flawless design work of Bevel Lemelisk.
    – Milo P
    Oct 29, 2022 at 3:10

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