A scientific theory….. is an explanation that accounts for the facts observed.
you have to understand, however, that a basic principle of science is that: “just because: if a particular explanation were true, then that would explain the observed facts, does NOT make the theory true or even likely.”
for example:
my car didnt start today
well if it were the case that an escaped monkey poured some sugar in my gastank that WOULD explain why my car didnt start. but it is not a proof of my monkey theory.