It was an interesting premise and I loved both Grace and Rocky finding ways to work together and compliment each other’s strengths and weaknesses. The threads of friendship and sacrifice (mostly on Rocky’s side at least initially) were inspiring. 

It was a bit bizarre how detailed the science and math got, especially since it wasn’t really relevant to the story in the grand scheme of things. But my biggest struggle is it was just so slow and there was hardly any character development - like the science team he considered close friends or huge losses, but there was not really anything in the storyline to back that up or give that context.  And Grace himself was frequently a bit petulant and whiny, which got annoying. However I absolutely loved Rocky as a character