I recently watched this one. The story centers around three astronauts being cajoled into a plot to fake a mars landing so that the space program gets more funding. The astronauts learn that the official story given to the public is that they were killed on reentry and so try and make their escape to avoid actually being killed by the people running the conspiracy. Good movie, and it starred James Brolin.
Just to clarify, I am not one of those guys who is into the 'moon landing was faked ' conspiracy theory thing. I liked this one cause it reminded of many of the movies I grew up watching about ordinary ( or almost ordinary ) people who get themselves into this situation and spend the rest of the movie trying to extricate themselves and escape the danger, an element of anxiety, running all night/day type of story. Movies like The Terminator, Escape from New York, Westworld, The Warriors and Judgement Night come to mind.