Yes, but here's my problem with expected trajectory being used as evidence of aliens, and 'unknown force' being used as some mysterious alien technology.

If I remember right, one of the voyager or pioneer probes was moving much faster than it should've been (relatively), and we had no idea why for years. Then we figured out it was the cumulative effect of heat radiation(?) from something on board the machine.

If we can't figure out what WE made, how can we expect to figure out a once-in-a-generation event like this on the first shot?