In case you missed the Discovery Channel's "When We Left Earth: The NASA Missions" and are too frugal to buy the Blu-ray boxed set, NASA TV will be airing two hours of historical footage in HD next week. It's a small subset of the 150-hours of footage that made the leap to HD for the Discovery Channel's production, but like we said, it's free. Honestly, some of the footage drawn from the older end of the 50-year span was less than stellar in picture quality, but that's a limitation of the source material. The special will air on August 8, 11 and 12 at 9AM EST. If your carrier sends you the bits, let us know how it looks in the comments below.