Importance of earth

There are two versions of Earth mentioned in the story. One is Sol-Earth, which is the earth that is known to the reader. However, Sol-Earth has changed drastically. NASA discovered an inhabitable planet some 300 years away and decided that it could be inhabited - more successfully - than the current earth. The current earth struggles with environmental issues and many other problems that could be solved on a new planet. The new planet would allow select leaders to seek out new and untapped natural resources. The top military people and scientists capable of making it happen are cryo frozen to create this new future. Amy Martin's parents are top personnel and have been chosen to go into space. Amy goes along as "non-essential" cargo.