Lost

After Earth is lost in a sheet of ice and snow, humanity is forced to leave their home in search of another.
Seventeen year old Thora Pickney is woken from cryo-sleep one hundred and thirty seven years after humanity's departure from Earth. She learns of the Imperial's plan, which is to send down thirty criminal teenagers to find out if the new planet, Cressida, is survivable. And Thora's leading the mission from the ground.
(This is unedited for the most part)