Alouette's Song is the first novel in Andrew Jonathan Fine's Alouette story cycle.
This book also has a fan page on Facebook.
Synopsis: Four teens from separate walks of life have fated encounters that will not only bring them together as lovers and friends, but as saviors. Together, they will kick open the door to humanity's settlement of the Milky Way. But only ingenuity, compassion, valor, and prayer will see them through their adventures before they can safely return home!