|
Walking With Dinosaurs is seminal watching for anyone with an interest in big reptilian beasties, and has yet to be surpassed as dino documentaries.
Not sure about the space ones, but the recommendations above are pretty good. You'll either really like the stuff with Brian Cox, or really hate it (I actually find him rather annoying, but I can't argue with the science side of it).
If you just want something that's amusing, often very tangential and still rather informative, check out QI, it's the perfect mix of hilarious and educational, and all on youtube to boot.
|