OK, the first thing you need to know about Power Rangers Lost Galaxy is that it doesn't make any goddamn sense. The previous show, Power Rangers in Space (we'll get to that one in a minute), had been a huge ratings success, so the producers were eager to keep that trend going by keeping the Power Rangers focused on cosmic adventures for another year. The only problem was that the show they were adapting, Seijuu Sentai Gingaman, wasn't about space at all. It was about nature, and it featured a team of warriors tasked with protecting a magic forest.
Needless to say, that did not stop the producers of Lost Galaxy from cramming it into a spaceship and blasting it off into space -- which is kind of literally what they did. In order to get around the stock footage of robots and monsters fighting in forests and deserts, the premise of the show was that everyone was on a gigantic space colony that featured cities, deserts, forests, and everything else that you'd find on Earth, which didn't really smooth things over as much as it raised the question of why they didn't just set the show on Earth in the first place.
"It's pretty cool that Earth's become a space-traveling planet with a fully trained multinational space fleet."
"Yeah, those were a crazy three months."