I've heard the abbreviation NPD mission string.....what it stand for, an how do i get it??! It's required to play Secession......Boy, I'm fulla mission questions, aren't I? You guys must love hearing me complain, lol....Anyways, I would be eternally greatful if you could help me out here. 
------------------
-------------------------
"It is better to keep your mouth closed and appear stupid, then to open it and remove all doubt. "
NPD is Nebula Penatration Device, which lets you penetrate into both the Proxima and Ji Nebulas. You havt to have completed the Miranu/UE relations missions, go to Mira (or Station Pybin, I can't remember) and you're approached by a Miranu scientist, blah blah blah. You go to some new resaerch facility between Yelts and whatever the name of that South Tip renegade system is. You get to go exploring in the Proxima Nebula, take soil samples of a planet, defend the research facility from an Igazra, explore the Ji Nebula, find a hospitible planet (which there is, believe it or not), and I believe that's it. Hope this helps!
—ESPilot
------------------
' Cross me, you die. Cross me twice, you die again ' —ESPilot
the mission is somewhere near mira, though it isn't on mira. i too think it's on station pybin.
------------------
