With a bit more Googling, it appears that hydrazine's lifetime in (Earth) atmosphere is measured in hours. I'm not sure what that would be on Mars, or if soaki

With a bit more Googling, it appears that hydrazine's lifetime in (Earth) atmosphere is measured in hours. I'm not sure what that would be on Mars, or if soaking into the soil there would increase its lifetime. It's a fun mental exercise, I guess -- I'd love to hear from somebody in the field who knew more about hydrazine -- but as the Opportunity rover is still a long (likely impossible) distance away from the crash site, it will likely just remain a mental exercise.