Reality Straight Up!

Thoughts & Observations of a Free Range Astrophysicist

In a Shark’s Eye

Science and the experience of wonder

Alone, 100 feet underwater, with a shark in its element, I am overwhelmed by a mixture of awe, beauty, joy, and intellectual wonder at the world that brings us together. In that moment, I experience just what science is all about.

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


Seen from above, the Bahama Banks are a spectacular sight. As I write this, I’m looking out the window of an airplane and taking it in. Ripples of color paint the ocean for miles on end. Bands of light green and blue give way to deeper turquoise. Beneath crystal clear water, undersea sand dunes formed by ocean currents stretch across vast expanses of flat-bottomed shallows. The Bahama Banks are the submerged top of the Bahama Archipelago, limestone grown by corals millimeters at a time over the past 100 million years or so.

But suddenly, the pastels give way to sharp-edged, soul-swallowing blue as dark as any the seas have to offer. This is the Tongue of the Ocean, a trench that drops as much as 14,000 feet to the ocean floor.

Bahama Banks

The Bahama Banks are ancient carbonate structures dating back to the breakup of the supercontinent of Pangea. The dark blue feature in the center, where the ocean floor falls abruptly to depths as great as 14,000 feet, is the “Tongue of the Ocean.”

Diving over the edge of the abyss.

The boundary of the Tongue of the Ocean is every bit as abrupt up close as it appears to be from 30,000 feet. I spent the past week with family scuba diving on the living reefs that built these islands. Some of the most spectacular of those reefs live right along the edge of the ocean trench where waves and currents keep nutrient-rich waters agitated, providing food for corals.

Even after three decades as an avid diver, I still find it eerie to be at the edge of the reef when the flat bottom abruptly gives way, becoming a vertical wall, covered in life. I can follow that wall down for about 100 feet before I have to stop. My dive computer reminds me that I can’t stay here long. If I do, the pressurized nitrogen in the air that I am breathing will turn my blood into deadly bubbles when I return to the surface. But the wall itself continues to plummet, vanishing into the depths. This is the abyss.

A passing shark is a reminder of who is at home in the depths, and who is not.

If the dive computer’s warning is not enough of a reminder that I am an interloper here, a large dark shadow materializing out of the gloom adds emphasis. It is far from the first time that I’ve encountered a shark under water. This is a Caribbean reef shark, an opportunistic feeder with a preference for an easily scavenged meal over the need to hunt.

We both know which of us is at home, and who has the upper hand. I am aware of the sleek form, hard muscles and keen eyes taking me in. I am also aware of the teeth. I have never really felt in danger around sharks, but let’s face it: There is a reason the divers who feed them wear chainmail!

Shark Dive

Spending July 4 on a shark dive in the Bahamas. From left to right, my son-in-law Casey Harrison, daughter Patricia, myself, and my wife, Vicki.

Sharks patrolling a reef usually have a slow, relaxed motion. Work at it and you can swim alongside for a time. But don’t imagine that means anything. As this shark swims past, something catches its attention. With no warning it flicks its tail, and before I fully register the change in behavior, the shark is easily 30 feet away and moving fast.

I think to myself about the evolutionary arms race that gifted the ancient and efficient shark with such bursts of speed, while also giving the fish that attracted its attention a fair chance of escape. How many countless billions of creatures lived or died over the millions of years that it took to evolve reactions so attuned to this environment?

Evolution offers me no such advantages here. My survival depends on training and the technology that I carry on my back. So why am I so at peace?

Experiencing the world as a scientist.

What I feel here calls to mind the first time that I looked at the rings of Saturn through a 3-inch refractor, or saw protozoans in a drop of pond water under a microscope. It is what I felt as a kid working on a wheat farm when at the end of the day I would shut down the tractor, lie down on the ground, and look at the spectacularly dark skies of northwestern Oklahoma.

What I feel hanging there with a shark in that column of saltwater is a sense of wonder. It is a sense of awe. It is a delicious blend of pure aesthetic experience heightened by intellectual understanding of the patterns and processes that shape the world.

And I remember why I am a scientist.

In a Shark’s Eye ^ Science and the experience of wonder  © Dr. Jeff Hester
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Click on thumbnail to select post:

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  • 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.

  • Being certain lights up our brains like a junkie’s next hit. Literally. Unfortunately, being certain and being right are two very, very different things.

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

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

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

  • Entropy is often maligned as the enemy of order. In truth, without the inexorable march of entropy, the universe would be a very boring place.

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

  • On a cold day in April, 2017 scientists gathered in Washington DC and cities around the world for the March for Science. Their message was a single powerful idea. Truth is not a political expediency. Reality cannot be ignored. In the year that has followed the vital importance of that message has only grown.

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

  • When I look at NASA’s new Administrator, Jim Bridenstine, it is his fellow Oklahoman Scott Pruitt’s EPA that jumps to mind. As politically uncomfortable science is pushed aside, NASA’s history of nonpartisanship appears headed for an abrupt end. Will a strongly partisan NASA have a target on its back?

  • Some years ago, NYU physicist Alan Sokal wondered whether anti-science postmodernists could recognize politically-correct-sounding nonsense even if he rubbed their noses in it. The unwitting subjects of the Sokal Hoax jumped at the bait.

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

  • Some people are sure they know more than the experts, but it can take a lot of knowledge to realize just how wrong an idea is.

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

  • The human brain craves the sensation of knowing like a drug addict craves the next fix. If real knowledge is uncomfortable or not at hand, we are quite content to just make something up, then convince ourselves it’s real. In a world where knowledge matters, that’s dangerous.

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    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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