The links are not dead, the site is. You cannot retrieve them in any way (unless you work at NSA or something lol).
I'm sorry about that. Why don't you wait for US2 to be publicly released in the meantime? It'll come out by the end of 2014, and there is a random planet generator included (for both Gas Giants and Terrestrial Planets. The "textures" it produces are pretty badass, so don't you worry).
I myself am an Alpha tester so I will be sure to make quite a few videos and pictures of US2 while the public waits. Stay tuned to the screenshots thread in the US2 Alpha Board to get some awesome views of US2's various bugs and features.