Pixel42
Schrödinger's cat
No. A fact is a repeatable observation or measurement.It means, fact is just as assumption in science sense?
The more times the fact is confirmed by observation or measurement the more confident we become that future observations and measurements will not give a different result. But we can never be 100% certain circumstances will not one day arise which will yield a different observation or measurement.
The classic example of a case where repeated observations were eventually contradicted is "all swans are white". That was an accepted fact, until it wasn't.