But we can also see the bar being heated, say by the sun, and then cooling down at night. If that's not hot enough for you, we could heat it with a lava flow form a volcano. Or from an undersea lava flow.
The universe is full of energy and temperature gradients of all magnitudes and slopes.
The problem I have with your attitude is that you actively seek to discourage research into this topic. If you are right, you need only sit back and gloat. The history of science suggests this is a losing position.
Of course, but we don't see the bar warming up at night and cooling down during the day. And your mindreading skills are absolutely abysmal. You have no idea of my attitude. I state what I know or believe to be fact. I give you the reasons for those beliefs or knowledge. I also know that people walk away from Vegas as winners, but I know that they are exceptions, not the rule.