> PowerPC landed on Mars !!

RAD750's predecessor RAD6000 (radiation-hardened and stripped-down POWER1) has been on Mars since 1997 even:
http://en.wikipedia.org/wiki/IBM_RAD6000
http://en.wikipedia.org/wiki/Mars_Pathfinder

RAD750 has been orbiting Mars since 2006:
http://en.wikipedia.org/wiki/Mars_Reconnaissance_Orbiter#Electronic_systems

Some more links on Power Architecture currently in space:
http://en.wikipedia.org/wiki/RHPPC
http://en.wikipedia.org/wiki/Comparison_of_embedded_computer_systems_on_board_the_Mars_rovers
http://en.wikipedia.org/wiki/Radiation_hardening#Examples_of_rad-hard_computers

The future of Power Architecture in space:
https://www.baesystems.com/en/article/freescale-power-architecture-technology-licensed-for-space-missions
https://www.fraunhofer.de/en/press/research-news/2012/january/precision-space-maneuvers.html
https://www.fokus.fraunhofer.de/go/muse_en
http://cdn0.scrvt.com/fokus/9a21364eee34a5f5/f814e4506e81f02eae19187a70d24287/SQC_Project_information_MUSE_1402_EN.pdf