When you first arrive on the site, you will be greeted by a homepage asking you, "Where would you like to go?"
When you hover over a planet, the name of the planet will show up underneath.
When the planet is clicked, information about the planet will appear. Below is the information for Earth:
The info for Mars:
Included in the information for Mars will be information and links to the Mars One project, which plans to put humans on Mars by 2023.
The info for Uranus:
It will be possible to click on the moons of each planet to get information about each of them. Every planet (and the sun) is clickable, and there will be information about dwarf planets, asteroids, and human structures.
The large question mark at the top will give general information about space travel, such as why it's important, what problems there are (distance, health, money, time), and links to where I gathered my information.