A Traveller credit is worth about $10 US, I believe. Most travel in this setting is interplanetary, that is within the system. Most of humanity lives within the Solar System, and in the Solar System, most people live on Earth. The population of the Earth at this time is 32.2 billion people. This includes people living in orbit around the Earth and people living on the Moon. The Moon doesn't have a government of its own, it consists of territories of various Earth nations, The United States has sovereignty over the Sea of Tranquility for instance, and it has statehood status, There is a settlement called Armstrong, named after the first astronaut to set foot on the Moon, there is the Apollo 11 Museum, a spaceport and a NASA installation there as well. NASA installations count as Scout Bases under Traveller rules.

NASA has been busy exploring other star systems. The nearest star system outside of Sol is Alpha Centauri, where three Garden planets reside, one around each of the stars in the System. the most Earthlike of those is the planet Aurora, orbitng the brightest star in the system designated as Alpha Centauri A, Alpha Centauri B has the Planet Prometheus which has a dense atmosphere and is slightly smaller than Venus with 0.85g surface gravity, and the largest planet is Minerva, a planet 10,378 miles in diameter (Size A), it has a gravity of 1.3g, a standard breathable atmosphere, and is tidally locked with the star Proxima Centauri. Those three planets are the only habitable ones within 5 parsecs outside the Solar System. The life on those three planets are DNA based, which indicates some sort of panspermia.

There are settlments on the three extra solar planets. Interstellar travel is a bit expensive, though recent developments have made it more affordable than has been the case until about 20 years ago. The first extra solar colonies are being established on those three habitable planets.