Reality Straight Up!

Thoughts & Observations of a Free Range Astrophysicist

Entropy Redux

Entropy Redux

Why our universe isn’t boring

A month’s worth of sunlight could pay the entropy bill for a billion years of biological evolution. Entropy is evolution’s best friend.

This article originally appeared in my Astronomy Magazine column, For Your Consideration.


I had so much fun writing about entropy last month that I just couldn’t stop! To catch you up on our sojourn through one of the most important but misunderstood ideas in science, here is a quick summary:

Disorder, schmisorder!

The Second Law of Thermodynamics is as much about building structure and complexity as it is about tearing them down. Last month I followed the entropy of an interstellar cloud as it collapsed to form stars and planetary systems. All of that complexity arose from a random, unguided progression toward more and more statistically likely configurations.

The onward march of entropy is the only thing that can produce complexity.

As it goes for stars and planets, so it goes for life, the universe, and everything. Not only can increasing entropy lead to structure and complexity, increasing entropy is the only thing that can produce complexity.

Let me explain. Shortly after the Big Bang, the universe was small, dense, and hot. The particles and radiation filling the universe were in thermodynamic equilibrium, which is just shorthand for saying that their entropy was as high as it could be. Had that been the end of the story, the universe would be a very boring place indeed. With no way for entropy to increase, nothing would have changed. There would be no galaxies, no stars, no planets, no nothing!
Entropy Evolution Annoys some people

The notion that complexity such as life emerges from random, unguided processes gets under some people’s skin like few things can. But stomping one’s foot doesn’t change physics. It only hurts the foot.

Fortunately for us, there was more to it than that. For reasons that remain unclear, but may have to do with the effects of cosmic inflation, the gravitational entropy of the early universe was much, much smaller than it might have been. The gap between what the entropy of the universe is and the maximum that it could be gives The Second Law elbowroom to do its thing.

Which brings us to what for many is the sticky wicket: entropy and life. Quoting Henry Morris of the Institute for Creation Research, “The law of increasing entropy is a universal law of decreasing complexity, whereas evolution is supposed to be a universal law of increasing complexity. . . . This, indeed, is a good question, and one for which evolutionists so far have no answer.”

The gap between actual and maximum possible entropy represents possibility.

Mr. Morris needs to get out more. The dismissive tone of his pronouncement does not change the fact that he doesn’t know statistical physics from cow dung.

Increasing entropy globally often involves decreasing entropy locally.

Reiterating, quite often the most likely path to increasing entropy globally involves decreasing entropy locally. Granted, accomplishing a local decrease in entropy requires energy. In the case of the interstellar cloud, that energy was gravitational, but other sources of energy will do. If you have ever paid a summer electric bill in Phoenix, your bank account understands the concept.

An air conditioner sucks heat out of already cool air, then exhausts that heat into already hot air. That’s about as uphill for entropy as it gets! I wonder if Mr. Morris marvels at the magical violation of the Second Law that keeps the temperature of his house pleasant. But there is no Second Law violation here. The energy dissipated (and entropy produced) powering the compressor and fan more than makes up for the entropy lost pumping heat from cold to hot.

Entropy is Evolution’s best friend.

So, what about life? Life isn’t plugged into the electrical grid, but we do have a handy fusion reactor nearby, along with an efficient energy-delivery system. Earth absorbs visible sunlight. That incoming energy is balanced by infrared light radiated into space. There are roughly 20 times as many reradiated infrared photons as there are absorbed visible photons. With 20 times as many photons to play with, there are a lot more ways of arranging things; the entropy of the reradiated infrared is far greater than the entropy of the absorbed sunlight. A lot can ride on the back of that huge increase in entropy.

In 2009, physicist Emory Bunn of the University of Richmond did a fun calculation. He started by making a very generous estimate of just how much localized decrease in entropy was needed to account for the evolution of life on Earth. Then he compared that with the rate at which absorption and reradiation of sunlight produces entropy. What he found is that all 4 billion years of the evolution of life can be “paid for” with just a few months of Earth’s entropy budget.

Putting that into terms that even Mr. Morris should be able to understand, claiming that entropy stands in the way of evolution is, quite literally, like saying that a billionaire can’t afford a stick of gum.

The next time you see a thunderstorm building overhead, or watch the flapping of a hummingbird’s wings, or hear a child’s laughter, smile and think about the beauty of the structure and complexity that surround us. The Second Law of Thermodynamics may get a bad rap, but any way you slice it, entropy rocks! 

Entropy Redux ^ Why our universe isn’t boring  © Dr. Jeff Hester
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Click on thumbnail to select post:

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  • Shaking the hand of someone you disagree with isn’t as much fun as shouting them down, but it is far more effective.


    When you live in small groups on the savanna, as our ancestors did for most of our evolutionary history, it pays to be suspicious of strangers. Other groups were competition. Strangers didn’t drop by for a cup of tea and a friendly chat about our emotional well being. We couldn’t afford to see a stranger as a real person at all.  It was an “us versus them” world. Fear and aggression were the only rational responses. People who did well in that world (AKA our ancestors, the people from whom we get our DNA), knew that the only safe thing was to beat strangers with a club first and ask questions later.

    Fear of “The Other” is hardwired, and talking about it doesn’t help.

    We may not live in small groups on the savanna any more, but our brains don’t know that. For better or worse we are stuck with our evolutionary baggage. Nothing is going to change that. When you encounter someone who your brain perceives as “other”– and by this I mean you personally, dear reader, as well as myself and every other human on the planet — all of that machinery jumps to life in milliseconds. Long before we are consciously aware of anything, our brains are screaming “Danger Will Robinson! Danger!”

    Call this tribalism. Call it racism. Call it in-group/out-group dynamics. Call it identity politics. Call it polarization. Call it whatever you like. It all comes down to the same thing. When we perceive someone as other our reactions are hard wired, preconscious, and impossible to turn off.

    Good intentions don’t matter. Get high and sing Kumbaya all night. Talk about it until the cows come home. Hold workshops. Post platitudes or scream about it on the internet. If you want to judge the effectiveness of those strategies all you have to do is pick up the paper. The louder the mob screams, the more ground they lose. We’ve tried those approaches. They make things worse, not better.

    Quoting Einstein’s famous parable, “Insanity is doing the same thing over and over and expecting different results.”

    There is only one solution: Humanize yourself by embracing the humanity of others.

    If you perceive someone as other you will respond to them as a threat. There’s nothing we can do about that. Or is there? Take a step back and the answer is obvious. We can’t change how we react to other, but we can change who we perceive as other.

    There is going on 70 years of really fascinating sociological, psychological, political and even neurological research that all supports the same conclusion: If you know and respect someone, it’s hard not to care about them. Break bread together, laugh together, talk deeply, listen, show respect (even when it’s difficult), build bridges, find common purpose and work arm in arm.

    I could dig into that research, but mercifully for you I won’t. Instead I am going to share an uplifting and illustrative story of what effective anti-racism really looks like.

    How did a Black musician change the hearts of hundreds of Klansmen?

    Daryl Davis is a Black blues and jazz musician with a very strange hobby. He goes to events like KKK rallies not to shout or protest, but to listen, shake hands, talk, and befriend. Literally hundreds of the Klan members who Daryl Davis has become friends with have renounced the Klan. He has a large collection of their robes, including the robe of a man who, when they met, was the Grand Wizard himself.

    Read that last sentence again. Then if you honestly care about fighting racism you owe it to yourself to invest 18 minutes and listen to Daryl Davis’s story in his own words.

    This is not your Woke friend’s Anti-Racism.

    It feels good to gang up and shout at people. The difference between the shouters and the shoutees makes it really easy to tell who is “us” and who is “them.” Our brains love that. The dopamine flows like a river.

    But that is not what Daryl Davis did. There was no shouting about racism. Terms like “White privilege” and “White fragility” were never used. Daryl Davis never complained about microaggressions or political correctness. DEI workshops were not part of the program. Mr. Davis did not wear his feelings on his sleeve. Quite the contrary, Daryl Davis listened even to open hatred and tried to understand where it was coming from. There was no talk of victims and oppressors. There were no social media attacks or calls for deplatforming. There was no virtue signaling about Wokeness.

    Instead, Daryl Davis treated those who were predisposed to hate him with dignity and respect. He listened. He questioned. He befriended. He humanized himself by seeing and acknowledging the humanity of others, including those with whom he deeply disagreed. In the process he did what few have ever accomplished. Daryl Davis changed the hearts of hundreds of the most committed racists in the nation.

    This is what real, effective anti-racism looks like. And as Davis mentions at the end of his talk, if he can do it, so can we.

  • What do record fire seasons in the West, record hurricane seasons in the Atlantic, record winter storms in the South and the hottest years in history have to do with each other? Everything.

    This article originally appeared in the December 2019 issue of my Astronomy Magazine column, For Your Consideration.

  • You don’t tug on Superman’s cape. You don’t spit into the wind. Yes, schools are desperately important to kids. No, COVID-19 doesn’t care, and COVID is making the rules right now. Attempts to open schools this fall will fail of their own accord. The relevant question is how to meet the needs of children, families and the community in the face of that reality.

  • Currently new cases of COVID-19 in Arizona are doubling every 7 days. ICU beds in the state are already full. The rest of the country isn’t that far behind us. You do the math.

  • Now is not the time for scientists to be circumspect and silent. We are on the short end of a battle over whether truth even matters. If scientists do not stand up for what is real, who will?

  • The morning cyclist in my neighborhood may not be standing in the Michigan Statehouse carrying a gun and demanding her right to spread contagion far and wide, but she may as well be.

  • You know those nice charts and graphs that make it look like we are over the hump of COVID-19 and that things are about to get better? Those predictions are dead wrong, with an unfortunate emphasis on “dead.”

  • Imagine three gregarious scientists, each with the gift of the gab, all coping with stay-at-home orders. Of course we started a livestream/podcast talk show! What else would we do? Welcome to the kickoff episode of Scientists Stuck Inside.

  • Even after COVID-19 kills hundreds of thousands in the U.S. over the coming weeks, we will still be almost as vulnerable to the pandemic as we are today. We’d all love to “get back to normal” after that, but the price could be a second wave, worse than the first. Some see us facing either economic Depression or allowing vast numbers of preventable deaths, but that is a fool’s choice. There are better options if we have the will to find them.

  • There is a lot of information about COVID-19 out there, much of it misleading. When looking at the future, start with what the science really says.

  • If someone can’t tell you how they would know that they are wrong, they don’t have a clue whether they are right.

    This article originally appeared in my Astronomy Magazine column, For Your Consideration.

  • Once seemingly incomprehensible, the origin of life no longer seems such a mystery. Most of what once appeared as roadblocks are turning out to be superhighways.

    This article originally appeared in my Astronomy Magazine column, For Your Consideration.

Over his 30 year career as an internationally known astrophysicist, Dr. Jeff Hester was a key member of the team that repaired the Hubble Space Telescope. With one foot always on the frontiers of knowledge, he has been mentor, coach, team leader, award-winning teacher, administrator and speaker, to name a few of the hats he has worn. His Hubble image, the Pillars of Creation, was chosen by Time Magazine as among the 100 most influential photographs in history.
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