Everything you need to understand or teach Tango Charlie and Foxtrot Romeo by John Varley.
Tango Charlie and Foxtrot Romeo is a moving story of the struggle to save a stranded child. It deals with profound questions of right and wrong. The mere fact that a child is in danger moves some characters to want to save her.
When the child turns out actually to be over thirty years old, the decision about whether to save her becomes more complicated, as if a grownup's life were less valuable...