I'd imagine it's length is longer than the Death Star's diameter, but with that said, I'm not sure of the Dreadnaught's size. Fan estimations based upon varying images is not concrete enough for me to believe in.
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Some say 19km.
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But based around what?
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Based on the distance between the rings of Saturn and how much the Dreadnought fits in it
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Well that's what I'm saying. It cannot be determined how long, or big in general, it is based around how it looks like it fits in. That varies and is not a constant.
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How do you compare a ships size ?
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Imo you don't. I would only take Bungie's word as final regarding its size.
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I see, so most sizes come from the writers.
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That's how I see it.