Pics for clicks
Realistic Rescale re-scales all planets and orbits to make both achieving orbit and traveling between planets much more difficult than it is in stock. Large manned interplanetary travel is really hard with conventional propulsion systems. Many bodies are approximately 3.2x the size and 6.4x the distance as they are in the stock game.
RR uses Sigma Dimensions to change the solar system. Kronometer is recommended if you want accurate times, and Outer Planets Mod is highl