From the introduction:
In the near future, so close it could be our own, an object is seen by astronomers. It moved from planet to planet, leaving behind drastic environmental change on each one. Until finally, it sat above mars. The countries of Russia, China and America sent cosmonauts on the Ares One mission, to try and make first contact with the very first extraterrestrial entity within range.
These were the first humans to witness the terraforming of Mars. On this day, the story of Humanity, the Earth and the very essence light and dark would change immutably forever.