Could it be?
Apparently (on some really rudimentary searching) that space is expanding at 68km/s per 3.2 million light-years (or 1 mega parsec). The more space the faster the speed and acceleration relative to us.
Andromeda is 2.5 million light years away and travelling toward us at 111km/s relative (250,000 mph)... the space inbetween is expanding at roughly 45km/s (due to less than 1Mparsec)... and this will reduce as Andromeda gets closer. Also as Andromeda gets closer the acceleration due to gravity will increase.
All information just from https://phys.org/news/2015-02-fast-universe.html
Biting the hand that feeds IT
