From a galaxy far, far away...
Dagobah was a planet in the Dagobah system, and one of the purest places in the galaxy within the Force. A remote world of swamps and forests, it served as a refuge for Jedi Grand Master Yoda during his exile after the destruction of the Jedi Order. It was here that Luke Skywalker received advanced training in the ways of the Force under Jedi Master Yoda.
Yoda proved how powerful the force was by lifting Skywalker's sinking X-Wing starship out of the murky swamps using nothing but his thoughts...
Movie Notes
George Lucas was so impressed by Frank Oz's performance as Yoda that he spent thousands of dollars on an advertising campaign to try and get him an Oscar nomination for Best Supporting Actor. Lucas's campaign ultimately failed because it was felt that a puppeteer wasn't an actor. Lucas felt this wasn't fair to Oz, who actually didn't mind.
When actor Mark Hamill was having trouble with the Dagobah scenes with Yoda, puppeteer Frank Oz characterized another puppet he voiced to make him laugh: Miss Piggy.
"Strong this planet is with the Force."
"It is one of the purest places in the galaxy."
―Yoda and the spirit of Qui-Gon Jinn
info thanks to: starwars.wikia
MAY THE FORCE BE WITH YOU!!!