That's an interesting question, what is the cubic volume of a 2d sector? In terms of linear distances of the order of magnitude of charted space there is at least one possible black hole:

https://i.imgur.com/upUNQxb.png

Is a subsector 8 parsec x 10 parsec x 1 parsec (80 cubic parsecs) or is it supposed to be spherical such that the two extreme sized of the sphere can be 10 pc apart from each other (5 parsec radius sphere = ~534 parsec^3?

The maximum distance between any two imperial worlds on travellermap is 232.075 parsecs. This is admittedly using euclidean geometry which Traveller does not use, but at least that is an approximate number. Should we presume the imperium is roughly spherical and thus the volume is around 6.5 million cubic parsec? Given local stellar volume then the imperium should contain about 916000 stars.

If we take "empire of 11000 suns" to its literal meaning using the local stellar density of 0.14 stars per cubic parsec that would be a sphere with a radius of 26.57 parsecs. Edge to Edge the imperium would only be 53 or so parsec across.

On Thu, Jul 16, 2020 at 4:56 AM Alan Peery <xxxxxx@tractare.co.uk> wrote:

On 2020-07-16 10:25, Jeff Zeitlin wrote:
  I believe that they were placed under the present
> passive subjunctive rule of creation (i.e.,"fiat", "let it be").

Which is as it should be.  If you think about the cubic volume even a
sector represents give real stellar density, we'd not be seeing very
many of these interesting objects. :-)

Alan
--
Bicycles are the most efficient machine yet invented for turning energy
into motion. Indeed, the bicycle has been accurately described as a kind
of green car, which can run on tap water and tea cakes and, moreover,
has a built-in gym.

Lord Taverne, UK House of Lords, in Nov 2015 debate
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