How did Rita Repulsa escape in Mighty Morphin Power Rangers?

In "Mighty Morphin Power Rangers," Rita Repulsa escapes from her prison on the Moon when her magical container is accidentally opened by the space astronaut, who is actually a character named Zordon's ally. This event occurs in the pilot episode, leading to her immediate attempt to conquer Earth. Rita unleashes her minions and begins her campaign against the Power Rangers soon after her escape.