[TML] Noncanonical TU 3D.

[Anthony Jackson]

rpg wrote:

> Active sensors simply matters considrably with a search like this, radar or
> even just a searchlight would be enough. Much easier than just relying on
> passive sensors with ambient light.

Nowhere near as much as you think. Active sensors have some advantages 
for noise reduction, but let's assume a 1,000 meter radar dish, with an 
MDS of 10^-19 joules. Now, the area of the radar is 2.5e5*pi m^2, and 
the area of a 1 AU sphere is 9e22*pi m^2 (3.6e17x greater), so the 
object must be reflecting at 1e-19*3.6e17 joules or 0.036 joules.

Now, the 1 km object has an area of 2.5e5*pi m^2 (again, 1/3.6e17 times 
the area of the sphere), so to cover the entire sky at 0.036 joules per 
1 km object, we have to emit 3.6e-2 * 3.6e17 or 1.3e16 joules.

Assuming a 1 gigawatt radar, that will take about five months.