Remember to spread a thin layer of your paste across it evenly, kids.
The first two designs are for the Europa Clipper proposal. The only difference in the second one I know of is that the team switched to using solar panels. The third design was released when NASA selected nine instruments for the official Europa mission. The multi-flyby concept offers great value so I'm glad NASA went with, essentially, the Europa Clipper.
I was more speaking in a visual sense, really. First we had this beauty:
Now we're getting rockets with large tailfins...
I've heard plans to send nuclear reactors to Mars to heat up the surface and release CO2, and I'm wondering...would using RTG's be a safer and cheaper option?