Edited by: Tau Cabalander on 04/09/2011 00:31:47
Every wormhole has at least one static wormhole that is always present. You have to find it. There can also be random incoming and outgoing wormholes.
I recommend dropping a single probe, putting it to max range so it covers the system (hopefully not a huge system over 32 au, hence a 256 au deep space probe is best, but a 64 au combat probe works almost as well), then look at the signal strengths. Write them down and scan them out from largest to smallest.
Outgoing wormholes can be any size, but incoming ones (K162) are always large, where large is twice the strength of a medium, and medium is twice the strength of a small. Anything in between these groups is also always a wormhole.
Example: 1.85% 0.97% 0.45%
Read Aandaan's post in the thread Deep Space Probe Exploration Guide