The invitation

"Overpopulation has caused Earth's natural resources to diminish, and people are struggling to survive. Thirteen-year-old Ari is looking after his little brother, Joni, who has fallen ill with a mysterious virus. The boys manage to get hold of a copy of Kepler62, the newest computer game that everyone's talking about and which is supposed to be almost impossible to complete. Working together, the brothers manage the impossible and they soon discover that Kepler62 is more than just a game. It's an invitation--for an adventure, to the outer reaches of our solar system"--Provided by publisher.