I’m a big fan of a company called The Great Courses. They sell video and audio courses taught by college professors, not for credit, but for a better understanding of the topic.

I’m currently watching lecture 5 of a course taught by Sean Carroll, who has a Ph.D. in physics, called Mysteries of Modern Physics: Time. I figured that if I was going to make such a big deal of my ideas on time (see my other posts), I ought to do more research.

He speaks of entropy repeatedly. The definition of entropy, I copied this from the internet for simplicity, is gradual decline into disorder. The natural state of the universe and everything in it is a process of going from order to disorder. In one of his lectures Dr. Carroll tells us that at the Big Bang the universe was very orderly and since then we are moving toward disorder. However, in lecture 5, he tells us that at absolute zero entropy also drops to zero. Meaning that there is no more disorder.

The temperature “approximately one second after the big bang, the universe was about 400,000 times as dense as water, and the temperature was 10 billion kelvins.” The quote comes from a website whose URL is sciencing.com. That’s hot. And, according to Dr. Carroll, close to zero entropy.

I’m no scientist, but does it seem odd that entropy is lowest when the temperature is at absolute zero, the lowest it can be, and also at it’s hottest? What do we make of this? I love reading and responding to replies, so feel free. I just want to make sense of this stuff.