If you scan a jump gate with active sensors will it give you the tech to build jump gates or just the components and how long will it take to get (approximately)?
If you use an active scan you will eventually get the knowledge to build jump gate construction modules, which also allows you to build jump gate components. How long it will take is very open ended. Every time you manage a successful scan you will get up to 10% of the tech points needed. The scan chance is equal to rolling a one on a random number check where the range is equal to (31104000 / seconds in increment).
So for a 1 day check the range is (31104000 / 86400) = 360 and the chance is 1/360 or 0.278%.
Multiple sensors will improve your chances and I often considered building a science ship with multiple small sensors for this type of mission. Its very specialised though as it would need to be close to its target, such as an alien ship or base, and most alien races wouldn't really appreciate it
Next question due to my myopia! I have recovered Precursor missiles from a ruined alien colony. Where can I see the missile specs?
On the tech view window (Ctrl-F7)
Steve