This mission is a fictional mission to the outermost and largest dwarf-planet, Eris, and its moon Dysnomia. The design of the probe and the mission is based on current technologies. To get there, you need to do flybys of the three largest planets, Jupiter, Saturn, and Neptune. While flying-by, you drop a ballon-suspended probe into each atmosphere.
This mission is not for the faint-hearted, you need a a good knowledge of how to do multiple flybys, and a lot of patience. Even at 100,000x speed, it takes at least 3 hours of flying to get to Eris and Dysnomia. You also need to watch your fuel use, too many course corrections, or too much use of the attitude thrusters and you will be flying by Eris with a dead spacecraft.
*****REQUIRED ADDONS*****
Outer planets 060929 - Rolf Keibel, Carl Romanik, Tony Dunn
   http://library.avsim.net/index.php?CatID=orbmisc
Eris and Dysnomia - Joseph Morgan
   http://www.orbithangar.com/searchid.php?ID=1343
Delta 4 Heavy Versatile - francisdrake
   http://www.orbithangar.com/searchid.php?ID=902