Is there a limit to how high you can heat something? If not (or if only limited by the amount matter - energy in the universe), then why is there are limit on cooling? In our daily frames of reference the rest of the universe is moving (planets orbiting, galaxies spinning etc...). If we are to accelerate towards the speed of light for a certain time and then drop out of it, all the frames of reference 'slower' than ours would seem to have 'aged' more. Is there a way to go slower, or even to the point of stopping so that the rest of the universe doesn't age but we do?. Would this be if we accelerated everything but us to the speed of light? Sorry for the dumb questions, I'm just sitting in this internet place in Madrid waiting to catch my flight home in a few hours and I'm bored.