Can You Beat Kerbal Space Program WITHOUT Leaving Kerbin?

In an alternate reality, kerbals realize that space is kinda terrifying and now refuse to leave Kerbin. Can we still unlock the whole tech tree?
Music in this video:
100 Pin Bowling- Wii Sports Resort -    • Wii sports resort music: Bowling 100 ...  
M.O.O.N. - Dust (Synthwave)-    • M.O.O.N - Dust (Synthwave)  
Art of Silence-    • Art of Silence - Dramatic / Cinematic...  
Kevin MacLeod - District Four -    • District Four  
Wallace and Gromit Theme -    • Wallace & Gromit - Extended Theme  
Home Depot Trap Remix -    • HOME DEPOT TRAP REMIX (BEST ONE)  
Lupus Nocte - Gaining Season -    • Gaining Season  
Backpacking - Silent Partner (outro) -    • Backpacking - Silent Partner  

Video that inspired me to try this out:    • Can You Beat Kerbal Space Program Wit...  
Low Kerbin Orbit Art - https://www.deviantart.com/mariomomen...
Deep Space Kraken Art-   / deep_space_kraken_fixed