Not impossible at all, just highly impractical. You must take into account that they could prepare footage beforehand. Agian, seemingly impossible, but it could be done. Then again it's not impossible for me to build a Gundam in my backyard either, it's just impractical, so maybe this is somewhat of a moot point.
So you're saying that Larry King, Jay Leno, and every other person who has interviewed a NASA crew is in on the conspiracy?
And yes, faking that footage would be impossible. I'm guessing you've never actually watched a lot of Zero G footage, because it would take years and the best computer graphics teams in the world to do what you're suggesting. Which is impossible, since they don't have YEARS to do this.
You seem to not be able to look at this with an open mind. It's not impossible, but so expensive, improbable, and impractical that a fabrication of this size would probably never see the light of day. It's possible that the government has planned all the major events that have taken place for the past 100 years, again hardly probable and goes agaisnt common sense, but not impossible.
Also, I'm not saying the footage is fake or that we've never been to space, just that it would be possible, just stupidly impractical and expensive to fake it.
Just like building a Gundam in my backyard, I could I guess, but how would I pay for college if I spent all my money (not that it would be enough) on developing an ultracompact fusion reactor to power a useless 50 foot tall robot?