Voyage is a science fiction novel by Stephen Baxter. Set in an alternative timeline, where JFK is only paralysed, and pushes America past the moon and onto Mars.

When the the rocket, Ares lifts off, carrying two men and one women, it is the culmination of years of ambition, technical achievment, and political intrigue.

Oh, if things had only been different, perhaps the stars themselves would have been within our grasp.