Question: What Is The Largest Fictional Spacecraft

[DieselJester]

If we're talking movable craft: I'm voting for Dolza's Fortress in the Robotech/Macross series. I use Jeff Russell's website as a cool tool for comparing sizes whenever I get in the mood to do crossover fanfic.

http://www.merzo.net/index.html

[Parallax]

The interior dimensions of the TARDIS have never really been explained, apart from them existing in their own dimension which is linked to (but separate) from our own. Pocket dimension, whatever you wish to call it. Exact size? Never said. Limitations? Never said. From what we have seen (The Invasion of Time, for instance) the interior dimensions are huge. Big enough that certain parts of the TARDIS haven't been used for centuries and even the Doctor can sometimes get lost in them if he isn't paying attention.

Personally, I'd just put it down to the interior dimensions are as large as the TARDIS wishes them to be/can be bothered allocating enough power to create them or even as a reflection of the TARDIS owners own mind (symbiotic link and all that). The interior dimensions don't seem to require main power to maintain (as we've seen on occasion, when the TARDIS loses main power the interior dimensions simply don't collapse). They can be regrown/remade if damaged or destroyed, even made to look completely differently as we've seen throughout the show.

So how big are TARDIS interiors? The size the story requires them to be, I guess.

[Stark]

So not ten billion light years and thus not competitive.

You could just as easily say the interior is slightly larger than the BBC building.

[Vendetta]

You could just as easily say the interior is slightly larger than the BBC building.

I'm sure there's room for a disused quarry or two in there as well.

[Enigma]

I'm surprised that no one mentioned Dahak or those Fourth Empire planetoids.

[Stark]

Probably because they're already at the 'absurdly extra-galactic size' and 'self-contained worldships' level. If you're not at least the size of Saturn, don't bother showing up. Shit, isn't Unicron the size of Saturn? LOL!

[Omeros]

Jack Williamson's second Legion of Space book features the Cometeers, a race who control a forcefield-enclosed 'vessel' which is twelve million miles long.

[Cykeisme]

Holy fucking shit, what the flying fuck?!

This should have effectively destroyed any further attempts at discussing the topic.

[The Yosemite Bear]

how about lens verse, I seem to recall ships that used stars as ammunition....

[Crossroads Inc.]

This should have effectively destroyed any further attempts at discussing the topic.

Yes well it IS an Anime after all
But it doesn't REALLY count as a "Spaceship"
Read my comment from earlier, about the show

To be "fair" the TTGL and the "Chu" TTGL existed in some "between the 11th and 12th dimension" in a place where mental will basically become physical form, so any laws of physics goes right out the window. So yeah in THAT Place, a giant robot/ship a billion light years tall? No problem...

So it isn't really "Real" sadly.

[Stark]

It pretty clearly exists. Next we'll hear that spiral energy isn't 'real'.

And the joke is that when you're ten million light years tall, you don't need a spaceship... you can just walk.

[andrewgpaul]

Surely there's bigger stuff than this in Xeelee or Culture wank?

Apparently not.

Wikipedia says of Bolder's Ring:

All matter in the universe was falling towards the object's massive gravity well. Even more astounding, this object and indeed the entire motion of the galaxies themselves appeared to be the work of the Xeelee, who were using the mass to create a ring of cosmic strings several million light years in diameter.

So it looks like it perhaps out-masses your giant green robot, but it's certainly much smaller.