PILGRIM: Travels in Space
Societies and cultures that had started or joined successful space programs by the mid-21st Century are generally far more visible by the end of the 22nd Century. Most notable of these are cultures derived from America, China, Western Europe, Japan, India, and Russia. Some planets, stations and colonies bear a significant bias to individual Earth cultures, but most locations exhibit a melting-pot.
In places like Mars, the Galilean moons, and other large human centers, independent cultures have started to arise, with many unusual traditions and customs. For example, Mars espouses a strong work ethic, so staining the hands in a variety of colors is considered a traditional cosmetic feature, to give the appearance of working on machinery (like the early colonists who produced the first Martian colonies). However, the divisions between many of these cultures are not nearly as defined as they once were in early history; the influence of solar networks and planetary internets have allowed a sort of osmosis in which many norms and fashions diffuse amongst humanity.
The most common languages that make up human society are those of the most populous groups, like English, Mandarin, Spanish, Hindi/Punjabi, Russian, Japanese, and German. Since most of these groups and nations were the most well-equipped to begin expansion into the Solar System, their languages became the most common throughout, leaving dozens of languages behind on Earth. This rapid adoption of several core languages has led to the demise of numerous dialects and smaller languages as cultures race to lay claim to what the can in space.