Ronda Rousey Tears Up During Phone Call With Daughter On 'Stars On Mars'

Ronda Rousey was brought back to earth for an emotional moment during her time on "Mars" ... with the UFC legend breaking down in tears during a video conversation with her daughter.

Ronda and other big names were completely separated from the real world for weeks as they competed on the Fox show, "Stars on Mars" ... and in the latest episode of the series, all the remaining contestants appear to be struggling with their living conditions.

In an emotional clip, Ronda is shown FaceTiming with her 1-year-old, La'akea, and her husband, Travis Browne ... and she can't help but cry as she looks at her daughter's smiling face.

"Hi, my beautiful angel!!" Ronda said ... with Travis replying, "We love ya."

Ex-NFL star Richard Sherman also shared his issues with being away from his loved ones ... admitting he felt like he was experiencing "space madness."

Lance Armstrong said the competition is no joke ... adding, "The long game here is brutal. The mental side of this is torture."