LMR-061 · Cosmology
Entropy
The reason your room gets messier on its own.
§ A first look
§ Depths
Six ways into the same idea — from bedtime story to chalkboard. No order required.
L1 · Crayon
Told like a bedtime story.
For a curious 10-year-old. No jargon. Just a picture in your head.
Take a clean, tidy room. Live in it for a week. It gets messy on its own. To make it tidy again, you have to actually work at it. The universe does this too. Things naturally drift from organized to messy, never the other way. Hot things spread their warmth into cold things. Sandcastles fall apart, they don't build themselves. The fancy science word for 'how messy something is' is entropy. And it can only go up, overall. That is also why time has a direction — because the past was tidier than the future. Yes, this means physics agrees that your room is not your fault. You're welcome.
§ Strange but true
- 01The universe is rolling, slowly, from order toward disorder. This is the only law of physics that knows which way time goes.
- 02Your refrigerator makes things colder by making the kitchen warmer — and the universe a tiny bit messier overall.
- 03A scrambled egg won't unscramble. Not because it can't — because the odds are astronomically against.
§ From the field journal
Entropy
"The reason your room gets messier on its own."
— observed, sketched, not yet fully understood.
§ Nearby
Constellations near Entropy
→
Heat Death
The universe's quiet, lukewarm forever.
→
Big Bang
Not an explosion in space. An expansion of space.
→
Time Dilation
Move fast, age slow. Sit in deep gravity, age slow. Time is weather.
→
Hawking Radiation
Black holes leak. Slowly. Eventually, even they disappear.
→
CMB
The afterglow of the Big Bang, still arriving 13.8 billion years later.
→
Dark Energy
Something is pushing space apart faster, and we have no idea what.