Here’s a little blurb I did for Clearancejobs.com to help people get a better understanding between the suitability for a government job and getting a government security clearance. How does this apply to space? Well, a lot of government space jobs require a security clearance whether you’re civilian government, military, or contractor. Some of the commercial space companies, such as Digitalglobe, also require a clearance for interacting with their government customer. So, definitely space related and you can read the short and hopefully clear definitions for them both, here.