Not bad at all. I especially liked the part telling how the Russians landed on Mars. I didn't really understand though what "spent too much time on strike" meant in the "Launch stages" section, what was "strike" in this case? Did they play Bowling or what? Also, I recommend you to add more funny quotes.
As I read through, I made the conclusion that this was pretty original. I didn't get that impression at first.
Prose and formatting:
It were many grammar and spelling mistakes, mostly in the beginning of the article. However, the layout of the article is great, but even so, the grammar and spelling is a very important part in an encyclopedia article, and those mistakes I mentioned lower the grade of this part considerably.
Most of your images were great. The last one however, is sized too small in the article, I can barely see that it is a control room, if not viewing the image on its own page. Also, the third one is pretty blurry, but still funny.
Your average score.
It is basically a good article. Add some more quotes at the top, and change that sentence about the french that I told you about, and you will earn a 10. Still, there are a bunch of spelling and grammar mistakes in the article, these need a fix. Also, improve the images slightly if possible, and you can even add more images.