Other Universe Sites:
The Universe - Everything you could possibly want to know about the Universe is here.
Sites of other nations:
The Wolf 359 Commonwealth
The Greater Federation of Asteel
The Solar Republic of Earth and Empire
The Sirian Socialist Republic
The Union of Xyon
In the 10 years since this website first started, exploration of (Old) Mars has proceeded at quite a rapid pace, making this section hard to keep up with. These are some links I've found interesting;
The Mars Society - Founded by rocket scientist and Mars enthusiast Dr Robert Zubrin, this is a US charity and clearing-house for Mars-related stuff.
Red Colony - A scientific website for a series of conferences dedicated to the colonising and terraforming of Mars.
Frans Blok's website - A Dutch Mars enthusiast who has maps of what Mars will look like after terraforming (one of which I borrowed for this site), a map of Kim Stanley Robinson's post-terraforming Mars, and an alternate timeline for Martian colonisation and indepedence.
Nasa Mars missions - Nasa's page for its various ongoing missions, including the Spirit, Opportunity and Curiosity rovers, orbiters etc. Including real-time images from the surface of Mars!
Malin Space Science Systems - The Californian company that processes the images from Voyager, Mars Global Surveyor etc. Great images of Old Mars, and of course the infamous Cydonia region, home of the 'face'/mildly face-like mesa, 'pyramid' etc. Forerunner carvings, or the product of an overactive imagination? You decide...