any observation that has been repeatedly confirmed and accepted as true; any scientific observation that has not been refuted
The structure of a cell membrane is considered a scientific fact.
Every day Florida shows how climate change is now a backyard reality as well as a scientific fact.
How could we ever say, as a matter of scientific fact, that one way of life is better, or more moral, than another?
“Equal time” may work for matters of political opinion, but not scientific fact.