Theory and hard science are too often confused.
Interestingly enough, it was the son of Charles Darwin who came up with the “theory” that the moon was moving away form the earth an why.
He was wrong about why and how but today we know for a fact that the moon is moving away from the earth.
//we know for a fact that the moon is moving away from the earth//
And if everything was old as they say it is, it would already be gone. Not that I adhere to any specific age of the solar system etc.
Theories are part of hard science.