Something that can be tested and observed. Something with overwhelming evidence in favor of a particular subject.
Of course, Science doesn't deal with absolutes. People may say "this is 100% proven" but that's wrong. Nothing in Science is 100%. It doesn't matter if it's physics, cell biology, chemestry, astromony etc.
However, if there are countless possibilities for anything (regardless of what it is) I go for the one that is falsifyable because that means research can be done in order to dismiss or confirm it.
Of course, Science doesn't deal with absolutes. People may say "this is 100% proven" but that's wrong. Nothing in Science is 100%. It doesn't matter if it's physics, cell biology, chemestry, astromony etc.
However, if there are countless possibilities for anything (regardless of what it is) I go for the one that is falsifyable because that means research can be done in order to dismiss or confirm it.