Voyage

Über

Voyage is a 1996 hard science fiction novel by British author Stephen Baxter. The book depicts a manned mission to Mars as it might have been in another timeline, one where John F. Kennedy survived the assassination attempt on him on November 22, 1963. Voyage won a Sidewise Award for Alternate History, and was nominated for the Arthur C. Clarke Award in 1997.
In 1999, it was adapted as a radio serial for BBC Radio 4 by Dirk Maggs.