The HTMHM Explorer

They found there Home world over populated. So, They built a fleet of ten World Ships the size of small moons, with the Speed of Light drives. The 1st ship left first, and then the 2nd ship, followed a few years later and every 2 years after that until all 10 World Ships where on the same course to the New World.  The first arrived eventually after uncountable years in space with its crew and population of millions rotating out of Cryo.  The 2nd ship arrived eventually, then the 3rd until the 9th arrived to report they lost contact with the 10th feared either destroyed or lost in space.
Two Hundred and fifty year later on the New World.  We find a group of five older teens, in a special study group program for exceptional teens. They came to question the official Captain's logs of the 9th World Ship now in orbit around the New World with the other Would Ships now artificial Moons.  The teens highjack an experimental space Yacht to reach the 9th moon to discover the truth about the 10th World Ship.  In the backup ghost data in the central data bank of the captain's log, they discover the truth of cover ups by the Captain of the 9th.  They also discovered secrets between themselves.
They decided to go find the 10th World Ship and discover its fate.  Sneaking off with the experimental Yacht with the latest Speed of Light Drive.