Well, sort of:
Wind River Systems, Inc., the global leader in Device Software Optimization (DSO), today announced that it has been selected by Honeywell Aerospace to support the development of NASA's New Millennium Program Space Technology 8 (ST8) Dependable Multiprocessor. The contract marks the first time a Linux platform has been selected by Honeywell for a space mission. Honeywell Aerospace is the prime contractor for NASA's ST8 Dependable Multiprocessor project. Wind River® Platform for Network Equipment, Linux Edition, will be the underlying operating system to support the processing of science and experiment data onboard the ST8 spacecraft.
What's ironic here is that Wind River was once one of the biggest sceptics about open source in these kind of mission-critical situations. How times change. How times will change. (Via DaniWeb.)