Gotcha, thanks.
Any reason to settle Mars if nothing is there, then? Also, is there anything else I ought to be doing while my survey ships bum around and such? I'm rolling on thirty-day increments right now, shipyards are working, factories are making automines, researches researching, etc. Anything I missed? Mostly, I'm not sure how much time I should be spending doing what, but since I didn't start with an NPR in the galaxy and I haven't explored any jump points, I'm less worried.
Also, a jump point called Unex popped up by the sun without my gravisurvey team having a look, nor was there a gravisurvey point there. Should I be concerned?
Edit: And another popped up on a non-gravisurvey point, though it was near one. Same place.
Editedit: And a third to Unex.
It depends on what you've found; if you've explored a dozen systems and not found a habitable/easily terraformable planet, you might think about settling it, but with no resources and the effort required to terraform it, it might not be worth it.
(Or you could just cheat with SM mode and regen resources for Mars. Or actually cheat and fill it with hundreds of millions of every resource, although that gets boring pretty fast.)
"Unex" is short for "Unexplored", it means that your gravsurvey ship(s) found a jump point to another system, and you haven't explored it yet. Keep in mind that JPs usually won't show up right on the survey point.
Also, regarding turn length: Use 1-day or 5-day turn lengths, as civ ships like freighters and colony ships tend to be dicks and wait for the end of a turn when they reach a planet, even if they have further orders. So Freighter 034 reaches Titan with an automine, drops it, and then sits around for 17 days until the end of the 30-day turn, as opposed to continuing with the orders at the start of the next 1-day or 5-day turn. 30-day is attractive because of the sped-up build rates and research rates, but it is ultimately less productive than obsessive day-by-day micro.
Also, make sure that in the Display tab of the system view you have "Events" checked on, so you'll know if the turn interrupt was a new officer being recruited or a hostile alien fleet smooshing one of your survey ships.