I hope time travel doesnt feature, time dilation would work, but the cast flying so FTL as to go back in time? No thank you
We know they'll be stranded on whatever planet they go to, so I would say we have a 2001 prologue, with a fade into the 21st century with the cast, at said archeological dig, so same place, many centuries later. I am so hoping they find a Jockey-ship and that'll be Prometheus.