The Order of Time by Carlo Rovelli

This book has helped me to understand the concept of time a bit better. The idea of time is very complicated and I haven't grasped it all but I think I'm in a better position now to keep on reading on this topic.

I got the point that time is not absolute but relative. It varies depending on mass and speed. So time passes slower on the ground than up in the air or in space. The closest you are to matter the slower time passes. Also the fastest you are travelling the slowest time passes for you. All this makes it impossible to conceive of a unique "present time" for everything that exists in the universe. So we cannot say what is happening "now" in the Andromeda galaxy for example because we don't share the same time patterns.

There is also strong connection between Entropy and time. In fact time is defined by Entropy. We can tell time is passing because Entropy has increased. "The difference between past and future does not lie in the elementary laws of motion; it does not reside in the deep grammar of nature. It is the natural disordering that leads to gradually less particular, less special situations. "

Explaining time becomes even more difficult when we introduce quantum physics. At the quantum level there isn't time. But it is somehow created through quantum interactions? I will have to reread this part of the book at some moment...

Oh and there is an excellent section at the end with Rovelli's thoughts about mortality and death. 👍

Anyways the book is excellent and written in an easy to understand language. It's the concepts it's trying to explain which are difficult.