The most INSANE Kerbal Space Program Craft/Interstellar Vehicle I've built.  
No Cheats, no Kraken Drives.  
 
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Space, Science, Physics, Light Speed, Kerbal Space Program, KSP, KSP 2, Universe, Stars, Planets, Jupiter, Saturn  
 
Note: Obviously it's impossible to approach light speed, however since KSP does not calculate exponential mass increase due to relativity and light speed, craft like these are 100% possible. In reality, this craft can approach around 89% Light Speed.