[TML] Noncanonical TU 3D.

[Anthony Jackson]

Timothy Little wrote:

> Though it should be possible to find a large cometary body in deep
> space from which to refuel.

Lemme think. A 1 km object, sunlit at 1 AU, has an apparent magnitude of 
16-19 depending on its albedo. Starlight is about a billion times dimmer 
than direct sunlight, so a 1 km deep space object, at 1 AU, would have 
an apparent magnitude of 39-42. That seems fairly impractical even with 
futuristic sensors.