A Star Wars trading card featuring members of Yoda’s unknown alien race at prayer.
Very little is known about the race Yoda belongs to, but since the only examples of the species we ever see are wise, serene Jedi masters (there’s never one just standing about in the background in a spaceport scene, for instance), it’s reasonable to assume they are a peaceful, spiritual, live monastic lives, and never leave their homeworld. It’s doubtful they even have technology or space travel…and if they do, use them sparingly.
George Lucas made it a policy to never show Yoda’s species. I guess it’s for the same reason that J.R.R. Tolkien added Tom Bombadil and never explained who he was, since in Tolkien’s words, “there should be some mysteries of a world unknown even to the creator.” For instance, the trading card above caused Lucasfilm to pulp the entire run to get it out of circulation. If George Lucas had a story idea behind Yoda’s race, we’ll never know it now, since he sold Star Wars and has no input on the projects.
Anecdotally, I remember that in the days before the internet was a thing, and every kid was obsessed with Star Wars, there was a bit of folklore going around on my playground that Yoda was actually from a race of giants, but as they get older, they get smaller. Who knows how things like that get started?