The next Explorer Mission is announced – Explorer 5! It will be a test mission for the upcoming crewed Jool mission that is still being planned.
Using technology demonstrated on CryoLab, Explorer 5 will take Kerbals at high speed to Duna, and then return them to Kerbin.
Kerbal States | Kerbin Space Exploration Administration 
I liked this patch because the Explorer 5 mission is a lot like the other missions, only a bit quirky with the new cryogenic pod and nuclear propulsion, so I took a more standard square pattern and changed the edge. The green star is meant to represent the next step of the cryogenic program, sending Kerbals to Jool.
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