# Logical proofs: Empirical evidence for constant gravity in the past and future

Hello everyone. I'm a first time poster, but a long time lurker. I don't have a degree in physics, but I have always held the discipline and all its branches, near to my heart.

A little background on the question. I got into an argument with a friend of mine about faith in religion and faith in science. He argues the following:

They are not vastly different. Each is the belief in something that cannot be empirically proven. Watching a hammer fall a billion times tells you nothing except that a hammer fell a billion times. If you want to make claims about what will happen the next time you drop a hammer you must put faith in a premise which cannot be empirically proven.

I brought up gravity and it being a constant across space and time in order for our universe to be in the condition it is today.

Here is a logical proof for knowing that gravity will be -9.8 m/s^2 tomorrow.

1. In the past gravity has always been -9.8 m/s^2
2. The future will resemble the past

Therefore

3. In the future gravity will be -9.8 m/s^2

Premise 2 cannot be proven empirically without the above argument becoming circular

I think I may have backed myself into a corner. I know there is a way around what he is saying, but I just can't come up with it! Logic has never been one of my strong points

Any help?