Re: IC: Space Exploration GURPS
4e dates from August of 2004, so pretty close to a decade. Of course, 3e was published back in 1988 so it had a long time to get entrenched with folks.
In short, though, the Lite rules are sufficient, especially if you have past GURPS knowledge. As the GM, I'd have a heavy role in character generation and I'd probably have to give you a few rules on specific things, but in general they're sufficient. For all of its rules density, GURPS is very flexible once you learn its tricks.
To expand on the world concept a bit more...
The 21st century ended poorly. The world at TL9 had polluted itself almost to the point of being uninhabitable. Small lunar and Martian colonies existed, but the fate of humanity seemed grim. Dozens of "Arc Ships" were launched from Earth, each bound for an Earthlike world in the near distance of space. Once there, the goal was for the ships to land and clone new humans (who would be dream-taught everything they needed to know) in a few short years. The ship drives of the time were primitive, and some of the genetic samples were mutated in transit. Others malfunctioned and never reached their destinations. Even more found that local conditions were harsher than expected and the fledgling colonies failed or devolved into tribal cultures.
Until the late 25th century, Earth experienced something of a dark age with much of the world's governments collapsing. A few nations remained, but resources were invariably turned inward to defense instead of outward. The Lunar and Martian colonies survived, even without support from earth, and were the main source of scientific advancement during that period.
During the 25th century, things started to turn around. The technology of the Martian-Lunar Alliance had expanded to the point that several moons around Jupiter now contained colonies and progress on making Venus habitable was progressing apace. Dozens of space stations hovered in the various asteroid belts, harvesting space debris for raw materials and fueling the advancement of the surviving human race. On March 19, 2515, the Martians finally returned to earth united the remaining peaceful nations under one banner. Within twenty years, the new Human Alliance controlled a third of the territory on Earth. Within fifty, it was half.
Small, one-sided conflicts continued to erupt on Earth for another few decades, but the entire solar system was united by the dawn of the 27th century.
It was at that point that earth could look outward once more. Old technology, long languishing in the data banks of Lunar archives, was brought out and improved upon. On July 7, 2841, the first human ship left the solar system in centuries. With a newly designed relativistic wave drive, the ship took only a week to cross the gulf between stars that an Arc Ship had taken thirty six years to cover. What they found on their arrival, though, was not good news. The first planet visited had only the scattered remains of a few human tribes. The second planet held no sign of an Arc Ship at all. This continued to be the story for much of the exploration mission. Only five of the forty three Arc Ships had yielded a viable colony, and only an additional eight held any groups of humans at all.
For the next two centuries, mankind again spread outward, this time armed with better technology and more experience.
The game takes place shortly after that. Mankind is just settling in to their corner of the galaxy, and they're alone as far as they know. FTL is limited to a parsec a day, which is amazingly fast but in galactic turns it's rather short range. A promising new tech is being tested that increase that by a factor of ten, which leads us to the story...