So, I'm currently writing a story that involves a human colony set up on 'another world' via portal-travel through what they assume to be an ancient device of alien origin - except that this world is Earth far into its future, completely reshaped in its geology, biological evolution, etc. The colonists have essentially gone on a one-way trip into the future from a 'semi-post-apocalyptic' year of 2180, to a time where all traces of their civilization have long been eroded away and other sapient species have since filled in the gap. My question is this - would these colonists recognize future-Earth as having once been their own planet, after having spent thirteen years there? Where the landmass is one colossal supercontinent, the day/night cycle is somewhere between 25-27 hours and the constellations have long since become unrecognizable? Would they have been able to glean it from fossil records and such, when their biggest focus the whole time has been to build a more solid foundation for themselves?