Eltar is Zordon's homeplanet, originally mentioned by Lord Zedd in Mighty Morphin Power Rangers: The Movie (though non-canon to the television series) and seen in the beginning of Power Rangers Turbo.
History
After the wizard Lerigot released him from the inter-dimensional timewarp that Rita Repulsa put him in long ago, Zordon returned to Eltar with Alpha 5 to reunite with his relatives while Dimitria of Inquiris continued to mentor the Turbo Rangers in his stead. The Phantom Ranger is initially said to be of Eltarian origin, though he is shown to reside on his own planet in Power Rangers in Space. The Robot Rangers also are from Eltar, built by Zordon and Alpha 5 as an experiment to develop perfect android likenesses of the Turbo Rangers.
In the final episodes of Turbo, word reaches the Rangers that war has broken out on Eltar and Zordon and Alpha 5 are under attack. Dimitria leaves for Eltar with the Blue Senturion to try and help, but their efforts ultimately fail and the planet falls under the rule of Dark Specter and his United Alliance of Evil. They then shutdown the Turbo Rangers power.s
With the death of Dark Specter and the defeat of all his forces in the aftermath of Zordon's sacrifice (though Alpha 5's whereabouts are unknown), Eltar is believed to once again be free from the clutches of evil. Following it's liberation the Turbo Powers were reactivated.
TV STORY-Countdown to Destruction
Cosmo Royale mentioned on his blog that he was wrapped in the finest Eltarian silk until his blog was destroyed by Galvanax. This mean that the Eltarians (at least some of them) work in a textile industry. TV STORY-The Adventures of Redbot